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Record Information

Version

5.0

Status

Detected but not Quantified

Creation Date

2021-09-10 22:37:48 UTC

Update Date

2021-09-26 22:54:07 UTC

HMDB ID

HMDB0245568

Secondary Accession Numbers

None

Metabolite Identification

Common Name

20-Hydroxypregn-4-en-3-one

Description

20-Hydroxypregn-4-en-3-one belongs to the class of organic compounds known as gluco/mineralocorticoids, progestogins and derivatives. These are steroids with a structure based on a hydroxylated prostane moiety. Based on a literature review very few articles have been published on 20-Hydroxypregn-4-en-3-one. This compound has been identified in human blood as reported by (PMID: 31557052 ). 20-hydroxypregn-4-en-3-one is not a naturally occurring metabolite and is only found in those individuals exposed to this compound or its derivatives. Technically 20-Hydroxypregn-4-en-3-one is part of the human exposome. The exposome can be defined as the collection of all the exposures of an individual in a lifetime and how those exposures relate to health. An individual's exposure begins before birth and includes insults from environmental and occupational sources.

Structure

MOL 3D MOL SDF 3D SDF PDB 3D PDB SMILES InChI

HMDB0245568
     RDKit          3D
20-Hydroxypregn-4-en-3-one
 55 58  0  0  0  0  0  0  0  0999 V2000
    4.5041    1.3096    0.1739 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2844   -0.1665   -0.0580 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.9344   -0.9456    0.8921 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.8797   -0.5372   -0.3365 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.7258   -2.0246   -0.5620 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.4595   -2.4542    0.0860 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.8159   -1.2008    0.5024 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.2620   -0.6740   -0.4156 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0088   -1.7262   -1.1337 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.0674   -1.0078   -1.9796 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.9499   -0.2022   -1.1053 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.2437   -0.2319   -1.3137 C   0  0  0  0  0  0  0  0  0  0  0  0
   -5.2203    0.5157   -0.5223 C   0  0  0  0  0  0  0  0  0  0  0  0
   -6.3413    0.8447   -0.9518 O   0  0  0  0  0  0  0  0  0  0  0  0
   -4.7747    0.8687    0.8718 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.3937    0.4067    1.1621 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4149    0.6286   -0.0031 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.5740    2.1214   -0.3285 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0271    0.3087    0.3884 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1140    1.5155    0.5319 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.3219    1.2387    0.2329 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.8383   -0.1136    0.6354 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.2747   -0.0534    2.0708 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.8976    1.8803   -0.5487 H   0  0  0  0  0  0  0  0  0  0  0  0
    5.5663    1.5582   -0.0966 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.2642    1.6451    1.1953 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.8513   -0.3788   -1.0189 H   0  0  0  0  0  0  0  0  0  0  0  0
    5.4503   -0.3645    1.5226 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.6127   -0.0682   -1.3316 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.6316   -2.5173   -0.1472 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.6963   -2.2991   -1.6366 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.7396   -3.0459    1.0003 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.8358   -3.1259   -0.5171 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.3280   -1.3652    1.5046 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.2889   -0.0934   -1.2178 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.3078   -2.1665   -1.9022 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.4211   -2.5307   -0.5396 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.5830   -1.7443   -2.5832 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.5095   -0.3155   -2.6390 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.6228   -0.8595   -2.1375 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.9681    1.9364    1.1038 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.5058    0.3073    1.5271 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.0340    0.9056    2.0712 H   0  0  0  0  0  0  0  0  0  0  0  0
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    1.5716    1.4352   -0.8360 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.1325   -0.6714    2.3270 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.3479    1.0075    2.4553 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.4225   -0.4693    2.6882 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0
  2  3  1  0
  2  4  1  0
  4  5  1  0
  5  6  1  0
  6  7  1  0
  7  8  1  0
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 21 22  1  0
 22 23  1  0
 22  4  1  0
 22  7  1  0
 19  8  1  0
 17 11  1  0
  1 24  1  0
  1 25  1  0
  1 26  1  0
  2 27  1  0
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  4 29  1  0
  5 30  1  0
  5 31  1  0
  6 32  1  0
  6 33  1  0
  7 34  1  0
  8 35  1  0
  9 36  1  0
  9 37  1  0
 10 38  1  0
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 12 40  1  0
 15 41  1  0
 15 42  1  0
 16 43  1  0
 16 44  1  0
 18 45  1  0
 18 46  1  0
 18 47  1  0
 19 48  1  0
 20 49  1  0
 20 50  1  0
 21 51  1  0
 21 52  1  0
 23 53  1  0
 23 54  1  0
 23 55  1  0
M  END


  Mrv1533004151516402D          

 23 26  0  0  0  0            999 V2000
    1.7447   -3.0280    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.5619   -3.1408    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.8728   -3.9050    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.0683   -2.4895    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.8390   -1.6970    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.5218   -1.2340    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.1731   -1.7404    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.9853   -1.5952    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.2655   -0.8192    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.0777   -0.6740    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.6095   -1.3047    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
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    6.0489   -2.8566    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.5171   -2.2259    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.2368   -3.0018    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.4247   -3.1470    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.8928   -2.5163    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.5330   -3.2587    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
  2  3  1  0  0  0  0
  2  4  1  0  0  0  0
  4  5  1  0  0  0  0
  5  6  1  0  0  0  0
  6  7  1  0  0  0  0
  7  8  1  0  0  0  0
  8  9  1  0  0  0  0
  9 10  1  0  0  0  0
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 11 12  2  0  0  0  0
 12 13  1  0  0  0  0
 13 14  2  0  0  0  0
 13 15  1  0  0  0  0
 15 16  1  0  0  0  0
 16 17  1  0  0  0  0
 11 17  1  0  0  0  0
 17 18  1  0  0  0  0
 17 19  1  0  0  0  0
  8 19  1  0  0  0  0
 19 20  1  0  0  0  0
 20 21  1  0  0  0  0
 21 22  1  0  0  0  0
  4 22  1  0  0  0  0
  7 22  1  0  0  0  0
 22 23  1  0  0  0  0
M  END
> <DATABASE_ID>
HMDB0245568

> <DATABASE_NAME>
hmdb

> <SMILES>
CC(O)C1CCC2C3CCC4=CC(=O)CCC4(C)C3CCC12C

> <INCHI_IDENTIFIER>
InChI=1S/C21H32O2/c1-13(22)17-6-7-18-16-5-4-14-12-15(23)8-10-20(14,2)19(16)9-11-21(17,18)3/h12-13,16-19,22H,4-11H2,1-3H3

> <INCHI_KEY>
RWBRUCCWZPSBFC-UHFFFAOYSA-N

> <FORMULA>
C21H32O2

> <MOLECULAR_WEIGHT>
316.485

> <EXACT_MASS>
316.24023027

> <JCHEM_ACCEPTOR_COUNT>
2

> <JCHEM_ATOM_COUNT>
55

> <JCHEM_AVERAGE_POLARIZABILITY>
37.6168430970865

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
1

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
1

> <JCHEM_IUPAC>
14-(1-hydroxyethyl)-2,15-dimethyltetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadec-6-en-5-one

> <ALOGPS_LOGP>
3.52

> <JCHEM_LOGP>
3.9411035990000007

> <ALOGPS_LOGS>
-4.49

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
4

> <JCHEM_PHYSIOLOGICAL_CHARGE>
0

> <JCHEM_PKA>
19.08781018820673

> <JCHEM_PKA_STRONGEST_ACIDIC>
19.003403431948026

> <JCHEM_PKA_STRONGEST_BASIC>
-1.0476375452966558

> <JCHEM_POLAR_SURFACE_AREA>
37.3

> <JCHEM_REFRACTIVITY>
93.73339999999997

> <JCHEM_ROTATABLE_BOND_COUNT>
1

> <JCHEM_RULE_OF_FIVE>
1

> <ALOGPS_SOLUBILITY>
1.02e-02 g/l

> <JCHEM_TRADITIONAL_IUPAC>
14-(1-hydroxyethyl)-2,15-dimethyltetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadec-6-en-5-one

> <JCHEM_VEBER_RULE>
1

$$$$

HMDB0245568
     RDKit          3D
20-Hydroxypregn-4-en-3-one
 55 58  0  0  0  0  0  0  0  0999 V2000
    4.5041    1.3096    0.1739 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2844   -0.1665   -0.0580 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.9344   -0.9456    0.8921 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.8797   -0.5372   -0.3365 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.7258   -2.0246   -0.5620 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.4595   -2.4542    0.0860 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.8159   -1.2008    0.5024 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.2620   -0.6740   -0.4156 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0088   -1.7262   -1.1337 C   0  0  0  0  0  0  0  0  0  0  0  0
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   -2.9499   -0.2022   -1.1053 C   0  0  0  0  0  0  0  0  0  0  0  0
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   -5.2203    0.5157   -0.5223 C   0  0  0  0  0  0  0  0  0  0  0  0
   -6.3413    0.8447   -0.9518 O   0  0  0  0  0  0  0  0  0  0  0  0
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   -2.4149    0.6286   -0.0031 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.5740    2.1214   -0.3285 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0271    0.3087    0.3884 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1140    1.5155    0.5319 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.3219    1.2387    0.2329 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.8383   -0.1136    0.6354 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.2747   -0.0534    2.0708 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.8976    1.8803   -0.5487 H   0  0  0  0  0  0  0  0  0  0  0  0
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    4.2642    1.6451    1.1953 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.8513   -0.3788   -1.0189 H   0  0  0  0  0  0  0  0  0  0  0  0
    5.4503   -0.3645    1.5226 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.6127   -0.0682   -1.3316 H   0  0  0  0  0  0  0  0  0  0  0  0
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    2.6963   -2.2991   -1.6366 H   0  0  0  0  0  0  0  0  0  0  0  0
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   -3.6696    2.3928   -0.3954 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.1586    2.3740   -1.3025 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0801   -0.1039    1.4455 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.4436    2.2366   -0.2566 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.2328    1.9743    1.5348 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.9234    1.9977    0.8069 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.5716    1.4352   -0.8360 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.1325   -0.6714    2.3270 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.3479    1.0075    2.4553 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.4225   -0.4693    2.6882 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0
  2  3  1  0
  2  4  1  0
  4  5  1  0
  5  6  1  0
  6  7  1  0
  7  8  1  0
  8  9  1  0
  9 10  1  0
 10 11  1  0
 11 12  2  0
 12 13  1  0
 13 14  2  0
 13 15  1  0
 15 16  1  0
 16 17  1  0
 17 18  1  0
 17 19  1  0
 19 20  1  0
 20 21  1  0
 21 22  1  0
 22 23  1  0
 22  4  1  0
 22  7  1  0
 19  8  1  0
 17 11  1  0
  1 24  1  0
  1 25  1  0
  1 26  1  0
  2 27  1  0
  3 28  1  0
  4 29  1  0
  5 30  1  0
  5 31  1  0
  6 32  1  0
  6 33  1  0
  7 34  1  0
  8 35  1  0
  9 36  1  0
  9 37  1  0
 10 38  1  0
 10 39  1  0
 12 40  1  0
 15 41  1  0
 15 42  1  0
 16 43  1  0
 16 44  1  0
 18 45  1  0
 18 46  1  0
 18 47  1  0
 19 48  1  0
 20 49  1  0
 20 50  1  0
 21 51  1  0
 21 52  1  0
 23 53  1  0
 23 54  1  0
 23 55  1  0
M  END

HEADER    PROTEIN                                 15-APR-15   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   15-APR-15         0                                  
HETATM    1  C   UNK     0       3.257  -5.652   0.000  0.00  0.00           C+0
HETATM    2  C   UNK     0       4.782  -5.863   0.000  0.00  0.00           C+0
HETATM    3  O   UNK     0       5.363  -7.289   0.000  0.00  0.00           O+0
HETATM    4  C   UNK     0       5.727  -4.647   0.000  0.00  0.00           C+0
HETATM    5  C   UNK     0       5.299  -3.168   0.000  0.00  0.00           C+0
HETATM    6  C   UNK     0       6.574  -2.304   0.000  0.00  0.00           C+0
HETATM    7  C   UNK     0       7.790  -3.249   0.000  0.00  0.00           C+0
HETATM    8  C   UNK     0       9.306  -2.978   0.000  0.00  0.00           C+0
HETATM    9  C   UNK     0       9.829  -1.529   0.000  0.00  0.00           C+0
HETATM   10  C   UNK     0      11.345  -1.258   0.000  0.00  0.00           C+0
HETATM   11  C   UNK     0      12.338  -2.436   0.000  0.00  0.00           C+0
HETATM   12  C   UNK     0      13.854  -2.164   0.000  0.00  0.00           C+0
HETATM   13  C   UNK     0      14.846  -3.342   0.000  0.00  0.00           C+0
HETATM   14  O   UNK     0      16.362  -3.071   0.000  0.00  0.00           O+0
HETATM   15  C   UNK     0      14.323  -4.790   0.000  0.00  0.00           C+0
HETATM   16  C   UNK     0      12.807  -5.061   0.000  0.00  0.00           C+0
HETATM   17  C   UNK     0      11.814  -3.884   0.000  0.00  0.00           C+0
HETATM   18  C   UNK     0      11.291  -5.332   0.000  0.00  0.00           C+0
HETATM   19  C   UNK     0      10.299  -4.155   0.000  0.00  0.00           C+0
HETATM   20  C   UNK     0       9.775  -5.603   0.000  0.00  0.00           C+0
HETATM   21  C   UNK     0       8.259  -5.874   0.000  0.00  0.00           C+0
HETATM   22  C   UNK     0       7.267  -4.697   0.000  0.00  0.00           C+0
HETATM   23  C   UNK     0       6.595  -6.083   0.000  0.00  0.00           C+0
CONECT    1    2                                                            
CONECT    2    1    3    4                                                  
CONECT    3    2                                                            
CONECT    4    2    5   22                                                  
CONECT    5    4    6                                                       
CONECT    6    5    7                                                       
CONECT    7    6    8   22                                                  
CONECT    8    7    9   19                                                  
CONECT    9    8   10                                                       
CONECT   10    9   11                                                       
CONECT   11   10   12   17                                                  
CONECT   12   11   13                                                       
CONECT   13   12   14   15                                                  
CONECT   14   13                                                            
CONECT   15   13   16                                                       
CONECT   16   15   17                                                       
CONECT   17   16   11   18   19                                             
CONECT   18   17                                                            
CONECT   19   17    8   20                                                  
CONECT   20   19   21                                                       
CONECT   21   20   22                                                       
CONECT   22   21    4    7   23                                             
CONECT   23   22                                                            
MASTER        0    0    0    0    0    0    0    0   23    0   52    0
END

COMPND    HMDB0245568
HETATM    1  C1  UNL     1       4.504   1.310   0.174  1.00  0.00           C  
HETATM    2  C2  UNL     1       4.284  -0.167  -0.058  1.00  0.00           C  
HETATM    3  O1  UNL     1       4.934  -0.946   0.892  1.00  0.00           O  
HETATM    4  C3  UNL     1       2.880  -0.537  -0.336  1.00  0.00           C  
HETATM    5  C4  UNL     1       2.726  -2.025  -0.562  1.00  0.00           C  
HETATM    6  C5  UNL     1       1.460  -2.454   0.086  1.00  0.00           C  
HETATM    7  C6  UNL     1       0.816  -1.201   0.502  1.00  0.00           C  
HETATM    8  C7  UNL     1      -0.262  -0.674  -0.416  1.00  0.00           C  
HETATM    9  C8  UNL     1      -1.009  -1.726  -1.134  1.00  0.00           C  
HETATM   10  C9  UNL     1      -2.067  -1.008  -1.980  1.00  0.00           C  
HETATM   11  C10 UNL     1      -2.950  -0.202  -1.105  1.00  0.00           C  
HETATM   12  C11 UNL     1      -4.244  -0.232  -1.314  1.00  0.00           C  
HETATM   13  C12 UNL     1      -5.220   0.516  -0.522  1.00  0.00           C  
HETATM   14  O2  UNL     1      -6.341   0.845  -0.952  1.00  0.00           O  
HETATM   15  C13 UNL     1      -4.775   0.869   0.872  1.00  0.00           C  
HETATM   16  C14 UNL     1      -3.394   0.407   1.162  1.00  0.00           C  
HETATM   17  C15 UNL     1      -2.415   0.629  -0.003  1.00  0.00           C  
HETATM   18  C16 UNL     1      -2.574   2.121  -0.329  1.00  0.00           C  
HETATM   19  C17 UNL     1      -1.027   0.309   0.388  1.00  0.00           C  
HETATM   20  C18 UNL     1      -0.114   1.516   0.532  1.00  0.00           C  
HETATM   21  C19 UNL     1       1.322   1.239   0.233  1.00  0.00           C  
HETATM   22  C20 UNL     1       1.838  -0.114   0.635  1.00  0.00           C  
HETATM   23  C21 UNL     1       2.275  -0.053   2.071  1.00  0.00           C  
HETATM   24  H1  UNL     1       3.898   1.880  -0.549  1.00  0.00           H  
HETATM   25  H2  UNL     1       5.566   1.558  -0.097  1.00  0.00           H  
HETATM   26  H3  UNL     1       4.264   1.645   1.195  1.00  0.00           H  
HETATM   27  H4  UNL     1       4.851  -0.379  -1.019  1.00  0.00           H  
HETATM   28  H5  UNL     1       5.450  -0.364   1.523  1.00  0.00           H  
HETATM   29  H6  UNL     1       2.613  -0.068  -1.332  1.00  0.00           H  
HETATM   30  H7  UNL     1       3.632  -2.517  -0.147  1.00  0.00           H  
HETATM   31  H8  UNL     1       2.696  -2.299  -1.637  1.00  0.00           H  
HETATM   32  H9  UNL     1       1.740  -3.046   1.000  1.00  0.00           H  
HETATM   33  H10 UNL     1       0.836  -3.126  -0.517  1.00  0.00           H  
HETATM   34  H11 UNL     1       0.328  -1.365   1.505  1.00  0.00           H  
HETATM   35  H12 UNL     1       0.289  -0.093  -1.218  1.00  0.00           H  
HETATM   36  H13 UNL     1      -0.308  -2.166  -1.902  1.00  0.00           H  
HETATM   37  H14 UNL     1      -1.421  -2.531  -0.540  1.00  0.00           H  
HETATM   38  H15 UNL     1      -2.583  -1.744  -2.583  1.00  0.00           H  
HETATM   39  H16 UNL     1      -1.509  -0.315  -2.639  1.00  0.00           H  
HETATM   40  H17 UNL     1      -4.623  -0.859  -2.137  1.00  0.00           H  
HETATM   41  H18 UNL     1      -4.968   1.936   1.104  1.00  0.00           H  
HETATM   42  H19 UNL     1      -5.506   0.307   1.527  1.00  0.00           H  
HETATM   43  H20 UNL     1      -3.034   0.906   2.071  1.00  0.00           H  
HETATM   44  H21 UNL     1      -3.443  -0.691   1.404  1.00  0.00           H  
HETATM   45  H22 UNL     1      -2.227   2.739   0.523  1.00  0.00           H  
HETATM   46  H23 UNL     1      -3.670   2.393  -0.395  1.00  0.00           H  
HETATM   47  H24 UNL     1      -2.159   2.374  -1.303  1.00  0.00           H  
HETATM   48  H25 UNL     1      -1.080  -0.104   1.445  1.00  0.00           H  
HETATM   49  H26 UNL     1      -0.444   2.237  -0.257  1.00  0.00           H  
HETATM   50  H27 UNL     1      -0.233   1.974   1.535  1.00  0.00           H  
HETATM   51  H28 UNL     1       1.923   1.998   0.807  1.00  0.00           H  
HETATM   52  H29 UNL     1       1.572   1.435  -0.836  1.00  0.00           H  
HETATM   53  H30 UNL     1       3.133  -0.671   2.327  1.00  0.00           H  
HETATM   54  H31 UNL     1       2.348   1.007   2.455  1.00  0.00           H  
HETATM   55  H32 UNL     1       1.422  -0.469   2.688  1.00  0.00           H  
CONECT    1    2   24   25   26
CONECT    2    3    4   27
CONECT    3   28
CONECT    4    5   22   29
CONECT    5    6   30   31
CONECT    6    7   32   33
CONECT    7    8   22   34
CONECT    8    9   19   35
CONECT    9   10   36   37
CONECT   10   11   38   39
CONECT   11   12   12   17
CONECT   12   13   40
CONECT   13   14   14   15
CONECT   15   16   41   42
CONECT   16   17   43   44
CONECT   17   18   19
CONECT   18   45   46   47
CONECT   19   20   48
CONECT   20   21   49   50
CONECT   21   22   51   52
CONECT   22   23
CONECT   23   53   54   55
END

HMDB0245568
     RDKit          3D
20-Hydroxypregn-4-en-3-one
 55 58  0  0  0  0  0  0  0  0999 V2000
    4.5041    1.3096    0.1739 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2844   -0.1665   -0.0580 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.9344   -0.9456    0.8921 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.8797   -0.5372   -0.3365 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.7258   -2.0246   -0.5620 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.4595   -2.4542    0.0860 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.8159   -1.2008    0.5024 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.2620   -0.6740   -0.4156 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0088   -1.7262   -1.1337 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.0674   -1.0078   -1.9796 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.9499   -0.2022   -1.1053 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.2437   -0.2319   -1.3137 C   0  0  0  0  0  0  0  0  0  0  0  0
   -5.2203    0.5157   -0.5223 C   0  0  0  0  0  0  0  0  0  0  0  0
   -6.3413    0.8447   -0.9518 O   0  0  0  0  0  0  0  0  0  0  0  0
   -4.7747    0.8687    0.8718 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.3937    0.4067    1.1621 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4149    0.6286   -0.0031 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.5740    2.1214   -0.3285 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0271    0.3087    0.3884 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1140    1.5155    0.5319 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.3219    1.2387    0.2329 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.8383   -0.1136    0.6354 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.2747   -0.0534    2.0708 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.8976    1.8803   -0.5487 H   0  0  0  0  0  0  0  0  0  0  0  0
    5.5663    1.5582   -0.0966 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.2642    1.6451    1.1953 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.8513   -0.3788   -1.0189 H   0  0  0  0  0  0  0  0  0  0  0  0
    5.4503   -0.3645    1.5226 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.6127   -0.0682   -1.3316 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.6316   -2.5173   -0.1472 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.6963   -2.2991   -1.6366 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.7396   -3.0459    1.0003 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.8358   -3.1259   -0.5171 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.3280   -1.3652    1.5046 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.2889   -0.0934   -1.2178 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.3078   -2.1665   -1.9022 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.4211   -2.5307   -0.5396 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.5830   -1.7443   -2.5832 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.5095   -0.3155   -2.6390 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.6228   -0.8595   -2.1375 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.9681    1.9364    1.1038 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.5058    0.3073    1.5271 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.0340    0.9056    2.0712 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.4433   -0.6913    1.4042 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.2275    2.7393    0.5234 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.6696    2.3928   -0.3954 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.1586    2.3740   -1.3025 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0801   -0.1039    1.4455 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.4436    2.2366   -0.2566 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.2328    1.9743    1.5348 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.9234    1.9977    0.8069 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.5716    1.4352   -0.8360 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.1325   -0.6714    2.3270 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.3479    1.0075    2.4553 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.4225   -0.4693    2.6882 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0
  2  3  1  0
  2  4  1  0
  4  5  1  0
  5  6  1  0
  6  7  1  0
  7  8  1  0
  8  9  1  0
  9 10  1  0
 10 11  1  0
 11 12  2  0
 12 13  1  0
 13 14  2  0
 13 15  1  0
 15 16  1  0
 16 17  1  0
 17 18  1  0
 17 19  1  0
 19 20  1  0
 20 21  1  0
 21 22  1  0
 22 23  1  0
 22  4  1  0
 22  7  1  0
 19  8  1  0
 17 11  1  0
  1 24  1  0
  1 25  1  0
  1 26  1  0
  2 27  1  0
  3 28  1  0
  4 29  1  0
  5 30  1  0
  5 31  1  0
  6 32  1  0
  6 33  1  0
  7 34  1  0
  8 35  1  0
  9 36  1  0
  9 37  1  0
 10 38  1  0
 10 39  1  0
 12 40  1  0
 15 41  1  0
 15 42  1  0
 16 43  1  0
 16 44  1  0
 18 45  1  0
 18 46  1  0
 18 47  1  0
 19 48  1  0
 20 49  1  0
 20 50  1  0
 21 51  1  0
 21 52  1  0
 23 53  1  0
 23 54  1  0
 23 55  1  0
M  END

View in JSmol View Stereo Labels

Synonyms

Not Available

Chemical Formula

C₂₁H₃₂O₂

Average Molecular Weight

316.485

Monoisotopic Molecular Weight

316.24023027

IUPAC Name

14-(1-hydroxyethyl)-2,15-dimethyltetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadec-6-en-5-one

Traditional Name

14-(1-hydroxyethyl)-2,15-dimethyltetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadec-6-en-5-one

CAS Registry Number

Not Available

SMILES

CC(O)C1CCC2C3CCC4=CC(=O)CCC4(C)C3CCC12C

InChI Identifier

InChI=1S/C21H32O2/c1-13(22)17-6-7-18-16-5-4-14-12-15(23)8-10-20(14,2)19(16)9-11-21(17,18)3/h12-13,16-19,22H,4-11H2,1-3H3

InChI Key

RWBRUCCWZPSBFC-UHFFFAOYSA-N

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as gluco/mineralocorticoids, progestogins and derivatives. These are steroids with a structure based on a hydroxylated prostane moiety.

Kingdom

Organic compounds

Super Class

Lipids and lipid-like molecules

Class

Steroids and steroid derivatives

Sub Class

Pregnane steroids

Direct Parent

Gluco/mineralocorticoids, progestogins and derivatives

Alternative Parents

Substituents

Progestogin-skeleton
20-hydroxysteroid
3-oxo-delta-4-steroid
3-oxosteroid
Oxosteroid
Hydroxysteroid
Delta-4-steroid
Cyclohexenone
Cyclic ketone
Secondary alcohol
Ketone
Organic oxygen compound
Hydrocarbon derivative
Carbonyl group
Organic oxide
Organooxygen compound
Alcohol
Aliphatic homopolycyclic compound

Molecular Framework

Aliphatic homopolycyclic compounds

External Descriptors

Not Available

Ontology

Physiological effect

Not Available

Disposition

Biological location

Non-excretory biofluid

Biofluid or Excreta

Blood (PMID: 31557052)

Source

Exogenous

Exogenous (PMID: 31557052)

Process

Not Available

Role

Not Available

Physical Properties

State

Not Available

Experimental Molecular Properties

Property	Value	Reference
Melting Point	Not Available	Not Available
Boiling Point	Not Available	Not Available
Water Solubility	Not Available	Not Available
LogP	Not Available	Not Available

Experimental Chromatographic Properties

Not Available

Predicted Molecular Properties

Property	Value	Source
logP	3.52	ALOGPS
logP	3.94	ChemAxon
logS	-4.5	ALOGPS
pKa (Strongest Acidic)	19	ChemAxon
pKa (Strongest Basic)	-1	ChemAxon
Physiological Charge	0	ChemAxon
Hydrogen Acceptor Count	2	ChemAxon
Hydrogen Donor Count	1	ChemAxon
Polar Surface Area	37.3 Å²	ChemAxon
Rotatable Bond Count	1	ChemAxon
Refractivity	93.73 m³·mol⁻¹	ChemAxon
Polarizability	37.62 Å³	ChemAxon
Number of Rings	4	ChemAxon
Bioavailability	Yes	ChemAxon
Rule of Five	Yes	ChemAxon
Ghose Filter	Yes	ChemAxon
Veber's Rule	Yes	ChemAxon
MDDR-like Rule	No	ChemAxon

Predicted Chromatographic Properties

Predicted Collision Cross Sections

Predictor	Adduct Type	CCS Value (Å²)	Reference
DeepCCS	[M-2H]-	206.39	30932474
DeepCCS	[M+Na]+	181.617	30932474
AllCCS	[M+H]+	182.5	32859911
AllCCS	[M+H-H2O]+	179.5	32859911
AllCCS	[M+NH4]+	185.2	32859911
AllCCS	[M+Na]+	185.9	32859911
AllCCS	[M-H]-	187.0	32859911
AllCCS	[M+Na-2H]-	187.4	32859911
AllCCS	[M+HCOO]-	188.0	32859911

Predicted Retention Times

Underivatized

Chromatographic Method	Retention Time	Reference
Predicted by Siyang on May 30, 2022	17.6097 minutes	33406817
Predicted by Siyang using ReTip algorithm on June 8, 2022	1.26 minutes	32390414
Fem_Long = Waters ACQUITY UPLC HSS T3 C18 with Water:MeOH and 0.1% Formic Acid	2716.4 seconds	40023050
Fem_Lipids = Ascentis Express C18 with (60:40 water:ACN):(90:10 IPA:ACN) and 10mM NH4COOH + 0.1% Formic Acid	460.5 seconds	40023050
Life_Old = Waters ACQUITY UPLC BEH C18 with Water:(20:80 acetone:ACN) and 0.1% Formic Acid	223.7 seconds	40023050
Life_New = RP Waters ACQUITY UPLC HSS T3 C18 with Water:(30:70 MeOH:ACN) and 0.1% Formic Acid	201.4 seconds	40023050
RIKEN = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid	513.8 seconds	40023050
Eawag_XBridgeC18 = XBridge C18 3.5u 2.1x50 mm with Water:MeOH and 0.1% Formic Acid	691.6 seconds	40023050
BfG_NTS_RP1 =Agilent Zorbax Eclipse Plus C18 (2.1 mm x 150 mm, 3.5 um) with Water:ACN and 0.1% Formic Acid	752.9 seconds	40023050
HILIC_BDD_2 = Merck SeQuant ZIC-HILIC with ACN(0.1% formic acid):water(16 mM ammonium formate)	99.6 seconds	40023050
UniToyama_Atlantis = RP Waters Atlantis T3 (2.1 x 150 mm, 5 um) with ACN:Water and 0.1% Formic Acid	1398.7 seconds	40023050
BDD_C18 = Hypersil Gold 1.9µm C18 with Water:ACN and 0.1% Formic Acid	495.7 seconds	40023050
UFZ_Phenomenex = Kinetex Core-Shell C18 2.6 um, 3.0 x 100 mm, Phenomenex with Water:MeOH and 0.1% Formic Acid	1542.6 seconds	40023050
SNU_RIKEN_POS = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid	464.0 seconds	40023050
RPMMFDA = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid	465.7 seconds	40023050
MTBLS87 = Merck SeQuant ZIC-pHILIC column with ACN:Water and :ammonium carbonate	289.7 seconds	40023050
KI_GIAR_zic_HILIC_pH2_7 = Merck SeQuant ZIC-HILIC with ACN:Water and 0.1% FA	505.5 seconds	40023050
Meister zic-pHILIC pH9.3 = Merck SeQuant ZIC-pHILIC column with ACN:Water 5mM NH4Ac pH9.3 and 5mM ammonium acetate in water	9.0 seconds	40023050

Predicted Kovats Retention Indices

Underivatized

Metabolite	SMILES	Kovats RI Value	Column Type	Reference
20-Hydroxypregn-4-en-3-one	CC(O)C1CCC2C3CCC4=CC(=O)CCC4(C)C3CCC12C	3664.6	Standard polar	33892256
20-Hydroxypregn-4-en-3-one	CC(O)C1CCC2C3CCC4=CC(=O)CCC4(C)C3CCC12C	2807.5	Standard non polar	33892256
20-Hydroxypregn-4-en-3-one	CC(O)C1CCC2C3CCC4=CC(=O)CCC4(C)C3CCC12C	2867.2	Semi standard non polar	33892256

Derivatized

Derivative Name / Structure	SMILES	Kovats RI Value	Column Type	Reference
20-Hydroxypregn-4-en-3-one,2TMS,isomer #1	CC(O[Si](C)(C)C)C1CCC2C3CCC4=CC(O[Si](C)(C)C)=CCC4(C)C3CCC12C	2811.7	Semi standard non polar	33892256
20-Hydroxypregn-4-en-3-one,2TMS,isomer #1	CC(O[Si](C)(C)C)C1CCC2C3CCC4=CC(O[Si](C)(C)C)=CCC4(C)C3CCC12C	2874.0	Standard non polar	33892256
20-Hydroxypregn-4-en-3-one,2TMS,isomer #1	CC(O[Si](C)(C)C)C1CCC2C3CCC4=CC(O[Si](C)(C)C)=CCC4(C)C3CCC12C	3115.6	Standard polar	33892256
20-Hydroxypregn-4-en-3-one,2TBDMS,isomer #1	CC(O[Si](C)(C)C(C)(C)C)C1CCC2C3CCC4=CC(O[Si](C)(C)C(C)(C)C)=CCC4(C)C3CCC12C	3302.5	Semi standard non polar	33892256
20-Hydroxypregn-4-en-3-one,2TBDMS,isomer #1	CC(O[Si](C)(C)C(C)(C)C)C1CCC2C3CCC4=CC(O[Si](C)(C)C(C)(C)C)=CCC4(C)C3CCC12C	3375.6	Standard non polar	33892256
20-Hydroxypregn-4-en-3-one,2TBDMS,isomer #1	CC(O[Si](C)(C)C(C)(C)C)C1CCC2C3CCC4=CC(O[Si](C)(C)C(C)(C)C)=CCC4(C)C3CCC12C	3362.2	Standard polar	33892256

Spectra

GC-MS Spectra

Spectrum Type	Description	Splash Key	Deposition Date	Source	View
Predicted GC-MS	Predicted GC-MS Spectrum - 20-Hydroxypregn-4-en-3-one GC-MS (Non-derivatized) - 70eV, Positive	splash10-0f7c-0191000000-968e4cf7b8ed26c86609	2021-09-24	Wishart Lab	View Spectrum
Predicted GC-MS	Predicted GC-MS Spectrum - 20-Hydroxypregn-4-en-3-one GC-MS (Non-derivatized) - 70eV, Positive	Not Available	2021-10-12	Wishart Lab	View Spectrum
Predicted GC-MS	Predicted GC-MS Spectrum - 20-Hydroxypregn-4-en-3-one GC-MS (TMS_1_1) - 70eV, Positive	Not Available	2021-11-03	Wishart Lab	View Spectrum
Predicted GC-MS	Predicted GC-MS Spectrum - 20-Hydroxypregn-4-en-3-one GC-MS (TMS_1_2) - 70eV, Positive	Not Available	2021-11-03	Wishart Lab	View Spectrum
Predicted GC-MS	Predicted GC-MS Spectrum - 20-Hydroxypregn-4-en-3-one GC-MS (TBDMS_1_1) - 70eV, Positive	Not Available	2021-11-03	Wishart Lab	View Spectrum
Predicted GC-MS	Predicted GC-MS Spectrum - 20-Hydroxypregn-4-en-3-one GC-MS (TBDMS_1_2) - 70eV, Positive	Not Available	2021-11-03	Wishart Lab	View Spectrum

MS/MS Spectra

Spectrum Type	Description	Splash Key	Deposition Date	Source	View
Predicted LC-MS/MS	Predicted LC-MS/MS Spectrum - 20-Hydroxypregn-4-en-3-one 10V, Positive-QTOF	splash10-0002-0093000000-ab06cb21bbb10c5db28e	2021-10-12	Wishart Lab	View Spectrum
Predicted LC-MS/MS	Predicted LC-MS/MS Spectrum - 20-Hydroxypregn-4-en-3-one 20V, Positive-QTOF	splash10-01dj-0963000000-8a6c9effd83cf8518c11	2021-10-12	Wishart Lab	View Spectrum
Predicted LC-MS/MS	Predicted LC-MS/MS Spectrum - 20-Hydroxypregn-4-en-3-one 40V, Positive-QTOF	splash10-0a4l-5900000000-73c5235aa96bd790fc9a	2021-10-12	Wishart Lab	View Spectrum
Predicted LC-MS/MS	Predicted LC-MS/MS Spectrum - 20-Hydroxypregn-4-en-3-one 10V, Negative-QTOF	splash10-014i-0009000000-be6e06313d0abca8e664	2021-10-12	Wishart Lab	View Spectrum
Predicted LC-MS/MS	Predicted LC-MS/MS Spectrum - 20-Hydroxypregn-4-en-3-one 20V, Negative-QTOF	splash10-00kb-0096000000-aa5720342dc94386a306	2021-10-12	Wishart Lab	View Spectrum
Predicted LC-MS/MS	Predicted LC-MS/MS Spectrum - 20-Hydroxypregn-4-en-3-one 40V, Negative-QTOF	splash10-00kr-0093000000-d927ec6970749b963596	2021-10-12	Wishart Lab	View Spectrum

Biological Properties

Cellular Locations

Not Available

Biospecimen Locations

Blood

Tissue Locations

Not Available

Pathways

Not Available

Name	SMPDB/PathBank	KEGG

Normal Concentrations

Biospecimen	Status	Value	Age	Sex	Condition	Reference	Details
Blood	Detected but not Quantified	Not Quantified	Not Specified	Not Specified	Normal	31557052	details

Abnormal Concentrations

Not Available

Associated Disorders and Diseases

Disease References

None

Associated OMIM IDs

None

External Links

DrugBank ID

Not Available

Phenol Explorer Compound ID

Not Available

FooDB ID

Not Available

KNApSAcK ID

Not Available

Chemspider ID

218808

KEGG Compound ID

Not Available

BioCyc ID

Not Available

BiGG ID

Not Available

Wikipedia Link

Not Available

METLIN ID

Not Available

PubChem Compound

249866

PDB ID

Not Available

ChEBI ID

Not Available

Food Biomarker Ontology

Not Available

VMH ID

Not Available

MarkerDB ID

Not Available

Good Scents ID

Not Available

References

Synthesis Reference

Not Available

Material Safety Data Sheet (MSDS)

Not Available

General References

Barupal DK, Fiehn O: Generating the Blood Exposome Database Using a Comprehensive Text Mining and Database Fusion Approach. Environ Health Perspect. 2019 Sep;127(9):97008. doi: 10.1289/EHP4713. Epub 2019 Sep 26. [PubMed:31557052 ]

Showing metabocard for 20-Hydroxypregn-4-en-3-one (HMDB0245568)

MOL for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

3D MOL for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

3D SDF for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

3D-SDF for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

PDB for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

3D PDB for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

SMILES for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

INCHI for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

Structure for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

3D Structure for HMDB0245568 (20-Hydroxypregn-4-en-3-one)

Predicted Collision Cross Sections

Predicted Retention Times

Underivatized

Predicted Kovats Retention Indices

Underivatized

Derivatized

GC-MS Spectra

MS/MS Spectra