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Record Information
Creation Date2005-11-16 15:48:42 UTC
Update Date2017-03-02 21:26:01 UTC
Secondary Accession NumbersNone
Metabolite Identification
Common NameEpitestosterone
DescriptionThe 17-alpha isomer of testosterone, derived from pregnenolone via the delta5-steroid pathway, and via 5-androstene-3-beta,17-alpha-diol. Epitestosterone acts as an antiandrogen in various target tissues. The ratio between testosterone/epitestosterone is used to monitor anabolic drug abuse.
17 alpha TestosteroneMeSH
Chemical FormulaC19H28O2
Average Molecular Weight288.4244
Monoisotopic Molecular Weight288.20893014
IUPAC Name(1S,2R,10R,11S,14R,15S)-14-hydroxy-2,15-dimethyltetracyclo[²,⁷.0¹¹,¹⁵]heptadec-6-en-5-one
Traditional Nameepitestosterone
CAS Registry Number481-30-1
InChI Identifier
Chemical Taxonomy
DescriptionThis compound belongs to the class of organic compounds known as androgens and derivatives. These are 3-hydroxylated C19 steroid hormones. They are known to favor the development of masculine characteristics. They also show profound effects on scalp and body hair in humans.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassSteroids and steroid derivatives
Sub ClassAndrostane steroids
Direct ParentAndrogens and derivatives
Alternative Parents
  • Androgen-skeleton
  • 3-oxo-delta-4-steroid
  • 3-oxosteroid
  • Hydroxysteroid
  • Oxosteroid
  • 17-hydroxysteroid
  • Delta-4-steroid
  • Cyclohexenone
  • Cyclic alcohol
  • Secondary alcohol
  • Ketone
  • Cyclic ketone
  • Organooxygen compound
  • Alcohol
  • Carbonyl group
  • Organic oxygen compound
  • Hydrocarbon derivative
  • Organic oxide
  • Aliphatic homopolycyclic compound
Molecular FrameworkAliphatic homopolycyclic compounds
External Descriptors
StatusDetected and Quantified
  • Endogenous
  • Food
  • Cell signaling
  • Fuel and energy storage
  • Fuel or energy source
  • Hormones, Membrane component
  • Membrane integrity/stability
  • Nutrients
  • Stabilizers
  • Surfactants and Emulsifiers
Cellular locations
  • Extracellular
  • Membrane (predicted from logP)
Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility0.033 mg/mLALOGPS
pKa (Strongest Acidic)19.09ChemAxon
pKa (Strongest Basic)-0.88ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count2ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area37.3 Å2ChemAxon
Rotatable Bond Count0ChemAxon
Refractivity84.43 m3·mol-1ChemAxon
Polarizability33.76 Å3ChemAxon
Number of Rings4ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectrum TypeDescriptionSplash Key
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 10V, Positive (Annotated)splash10-000i-0090000000-e1af5f6bcaf571731a2bView in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 25V, Positive (Annotated)splash10-052b-7900000000-581eb9c19ccb29ebac52View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 40V, Positive (Annotated)splash10-052b-9300000000-37c235bd069ce0c93813View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Linear Ion Trap , positivesplash10-0fk9-1690000000-b39908a52b06c7853085View in MoNA
1D NMR1H NMR SpectrumNot Available
2D NMR[1H,13C] 2D NMR SpectrumNot Available
Biological Properties
Cellular Locations
  • Extracellular
  • Membrane (predicted from logP)
Biofluid Locations
  • Blood
Tissue Location
  • Adrenal Gland
  • Gonads
  • Prostate
  • Testes
PathwaysNot Available
Normal Concentrations
Not Available
Abnormal Concentrations
BloodDetected and Quantified0.00132 +/- 0.00008 uMAdult (>18 years old)MaleEugonadism details
BloodDetected and Quantified0.00068 +/- 0.00004 uMAdult (>18 years old)MaleHypogonadism details
Associated Disorders and Diseases
Disease References
  1. Kicman AT, Coutts SB, Cowan DA, Handelsman DJ, Howe CJ, Burring S, Wu FC: Adrenal and gonadal contributions to urinary excretion and plasma concentration of epitestosterone in men--effect of adrenal stimulation and implications for detection of testosterone abuse. Clin Endocrinol (Oxf). 1999 May;50(5):661-8. [PubMed:10468933 ]
Associated OMIM IDs
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDFDB021799
KNApSAcK IDNot Available
Chemspider ID9789
KEGG Compound IDNot Available
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkEpitestosterone
NuGOwiki LinkHMDB00628
Metagene LinkHMDB00628
PubChem Compound10204
ChEBI IDNot Available
Synthesis ReferenceAlvarez, Francisco. Steroids. CCXLIX. A new synthesis of epitestosterone from pregnenolone acetate via nitrosation. Steroids (1963), 2(4), 393-8.
Material Safety Data Sheet (MSDS)Download (PDF)
General References
  1. Falk O, Palonek E, Bjorkhem I: Effect of ethanol on the ratio between testosterone and epitestosterone in urine. Clin Chem. 1988 Jul;34(7):1462-4. [PubMed:3390919 ]
  2. Kicman AT, Oftebro H, Walker C, Norman N, Cowan DA: Potential use of ketoconazole in a dynamic endocrine test to differentiate between biological outliers and testosterone use by athletes. Clin Chem. 1993 Sep;39(9):1798-803. [PubMed:8375050 ]
  3. Riondino G, Strollo F: [Age-dependent changes in epitestosterone urinary excretion in man]. Boll Soc Ital Biol Sper. 1981 Nov 30;57(22):2215-21. [PubMed:7326107 ]
  4. Starka L: Epitestosterone. J Steroid Biochem Mol Biol. 2003 Oct;87(1):27-34. [PubMed:14630088 ]
  5. Marenich LP: [Effect of chorionic gonadotropin on the urinary excretion of testosterone and other androgens in healthy men and those with coronary arteriosclerosis]. Kardiologiia. 1979 Jun;19(6):76-9. [PubMed:156806 ]
  6. Aguilera R, Hatton CK, Catlin DH: Detection of epitestosterone doping by isotope ratio mass spectrometry. Clin Chem. 2002;48(4):629-36. [PubMed:11901061 ]
  7. Bicikova M, Hampl R, Hill M, Starka L: Inhibition of steroid 17 alpha-hydroxylase and C17,20-lyase in the human testis by epitestosterone. J Steroid Biochem Mol Biol. 1993 Oct;46(4):515-8. [PubMed:8217882 ]
  8. Havlikova H, Hill M, Hampl R, Starka L: Sex- and age-related changes in epitestosterone in relation to pregnenolone sulfate and testosterone in normal subjects. J Clin Endocrinol Metab. 2002 May;87(5):2225-31. [PubMed:11994368 ]
  9. Yamamoto Y, Peric-Golia P, Osawa Y, Kirdani RY, Sanberg AA: Androgen metabolism in sheep. Steroids. 1978 Oct;32(3):373-88. [PubMed:715826 ]
  10. Kicman AT, Coutts SB, Cowan DA, Handelsman DJ, Howe CJ, Burring S, Wu FC: Adrenal and gonadal contributions to urinary excretion and plasma concentration of epitestosterone in men--effect of adrenal stimulation and implications for detection of testosterone abuse. Clin Endocrinol (Oxf). 1999 May;50(5):661-8. [PubMed:10468933 ]