You are using an unsupported browser. Please upgrade your browser to a newer version to get the best experience on Human Metabolome Database.
Record Information
StatusExpected but not Quantified
Creation Date2012-09-06 15:16:52 UTC
Update Date2018-05-20 20:19:34 UTC
Secondary Accession Numbers
  • HMDB15495
Metabolite Identification
Common NameAjmaline
DescriptionAn alkaloid found in the root of Rauwolfia serpentina, among other plant sources. It is a class Ia antiarrhythmic agent that apparently acts by changing the shape and threshold of cardiac action potentials. Ajmaline produces potent sodium channel blocking effects and a very short half-life which makes it a very useful drug for acute intravenous treatments. The drug has been very popular in some countries for the treatment of atrial fibrillation in patients with the Wolff Parkinson White syndrome and in well tolerated monomorphic ventricular tachycardias. It has also been used for many years as a drug to challenge the conduction system of the heart in cases of bundle branch block and syncope. In these cases, abnormal prolongation of the HV interval has been taken as a proof for infrahisian conduction defects tributary for permanent pacemaker implantation.
Chemical FormulaC20H26N2O2
Average Molecular Weight326.4326
Monoisotopic Molecular Weight326.199428086
IUPAC Name(1R,9R,10S,12R,13S,14R,16S,18R)-13-ethyl-8-methyl-8,15-diazahexacyclo[¹,⁹.0²,⁷.0¹⁰,¹⁵.0¹²,¹⁷]nonadeca-2,4,6-triene-14,18-diol
Traditional Nameajmaline
CAS Registry Number4360-12-7
InChI Identifier
Chemical Taxonomy
DescriptionThis compound belongs to the class of organic compounds known as ajmaline-sarpagine alkaloids. These are organic compounds containing either of the ajmalan, sarpagan skeleton, or derivative thereof. The Sarpagine (Akuammidine) group, based on the sarpagan nucleus, arises from bond formation between C-16 and C-5 of the corynantheine precursor. Ajmaline alkaloids are based on a 17,19-secoyohimban skeleton (oxayohimban) which is invariably present as an ether.
KingdomOrganic compounds
Super ClassAlkaloids and derivatives
ClassAjmaline-sarpagine alkaloids
Sub ClassNot Available
Direct ParentAjmaline-sarpagine alkaloids
Alternative Parents
  • Sarpagine-skeleton
  • Beta-carboline
  • Pyridoindole
  • Quinolizidine
  • Indole or derivatives
  • Dialkylarylamine
  • Quinuclidine
  • Tertiary aliphatic/aromatic amine
  • Azepane
  • Aralkylamine
  • Benzenoid
  • Piperidine
  • Cyclic alcohol
  • Secondary alcohol
  • Tertiary amine
  • Hemiaminal
  • Organoheterocyclic compound
  • Azacycle
  • Alkanolamine
  • Alcohol
  • Organopnictogen compound
  • Organonitrogen compound
  • Organic oxygen compound
  • Organic nitrogen compound
  • Amine
  • Organooxygen compound
  • Hydrocarbon derivative
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External Descriptors

Biological location:


Industrial application:

Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water Solubility4.09 g/LNot Available
LogP1.81HANSCH,C ET AL. (1995)
Predicted Properties
Water Solubility4.09 g/LALOGPS
pKa (Strongest Acidic)13.28ChemAxon
pKa (Strongest Basic)7.2ChemAxon
Physiological Charge1ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area46.94 ŲChemAxon
Rotatable Bond Count1ChemAxon
Refractivity92.57 m³·mol⁻¹ChemAxon
Polarizability36.75 ųChemAxon
Number of Rings6ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectrum TypeDescriptionSplash Key
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-0bta-2498000000-49bdb2b520b940e4152bView in MoNA
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (2 TMS) - 70eV, Positivesplash10-0a59-9006700000-c3e3a75dc9384667f4a8View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0a6r-0009000000-852cc00f822b12dde86fView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0a6r-0029000000-f1807eeec4b4f036d14fView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0a5c-1492000000-fc9be42e8caaa18f3f1dView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-004i-0009000000-622c9342ca8dd4c7306cView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-004i-0029000000-b0778df2272e5a83567cView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-055b-0092000000-b4a357ef59beb58eff9bView in MoNA
Biological Properties
Cellular Locations
  • Extracellular
  • Membrane
Biospecimen Locations
  • Blood
  • Urine
Tissue LocationsNot Available
Normal Concentrations
BloodExpected but not Quantified Not AvailableNot AvailableTaking drug identified by DrugBank entry DB01426 details
UrineExpected but not Quantified Not AvailableNot AvailableTaking drug identified by DrugBank entry DB01426 details
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDDB01426
Phenol Explorer Compound IDNot Available
FoodDB IDNot Available
KNApSAcK IDC00024294
Chemspider ID10145712
KEGG Compound IDC06542
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkAjmaline
METLIN IDNot Available
PubChem Compound441080
PDB IDNot Available
ChEBI ID28462
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Brugada J, Brugada P, Brugada R: The ajmaline challenge in Brugada syndrome: a useful tool or misleading information? Eur Heart J. 2003 Jun;24(12):1085-6. [PubMed:12804922 ]


General function:
Involved in monooxygenase activity
Specific function:
Responsible for the metabolism of many drugs and environmental chemicals that it oxidizes. It is involved in the metabolism of drugs such as antiarrhythmics, adrenoceptor antagonists, and tricyclic antidepressants.
Gene Name:
Uniprot ID:
Molecular weight:
  1. Preissner S, Kroll K, Dunkel M, Senger C, Goldsobel G, Kuzman D, Guenther S, Winnenburg R, Schroeder M, Preissner R: SuperCYP: a comprehensive database on Cytochrome P450 enzymes including a tool for analysis of CYP-drug interactions. Nucleic Acids Res. 2010 Jan;38(Database issue):D237-43. doi: 10.1093/nar/gkp970. Epub 2009 Nov 24. [PubMed:19934256 ]
General function:
Involved in ion channel activity
Specific function:
This protein mediates the voltage-dependent sodium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane, the protein forms a sodium-selective channel through which Na(+) ions may pass in accordance with their electrochemical gradient. It is a tetrodotoxin-resistant Na(+) channel isoform. This channel is responsible for the initial upstroke of the action potential in the electrocardiogram
Gene Name:
Uniprot ID:
Molecular weight:
  1. Barajas-Martinez HM, Hu D, Cordeiro JM, Wu Y, Kovacs RJ, Meltser H, Kui H, Elena B, Brugada R, Antzelevitch C, Dumaine R: Lidocaine-induced Brugada syndrome phenotype linked to a novel double mutation in the cardiac sodium channel. Circ Res. 2008 Aug 15;103(4):396-404. doi: 10.1161/CIRCRESAHA.108.172619. Epub 2008 Jul 3. [PubMed:18599870 ]
  2. Khodorov BI, Zaborovskaya LD: Blockade of sodium and potassium channels in the node of Ranvier by ajmaline and N-propyl ajmaline. Gen Physiol Biophys. 1983 Aug;2(4):233-68. [PubMed:6088360 ]
  3. Hermida JS, Dassonvalle E, Six I, Amant C, Coviaux F, Clerc J, Herent D, Hermida A, Rochette J, Jarry G: Prospective evaluation of the familial prevalence of the brugada syndrome. Am J Cardiol. 2010 Dec 15;106(12):1758-62. doi: 10.1016/j.amjcard.2010.07.049. [PubMed:21126620 ]
  4. Hoogendijk MG, Potse M, Vinet A, de Bakker JM, Coronel R: ST segment elevation by current-to-load mismatch: an experimental and computational study. Heart Rhythm. 2011 Jan;8(1):111-8. doi: 10.1016/j.hrthm.2010.09.066. Epub 2010 Oct 30. [PubMed:20870038 ]
  5. Leoni AL, Gavillet B, Rougier JS, Marionneau C, Probst V, Le Scouarnec S, Schott JJ, Demolombe S, Bruneval P, Huang CL, Colledge WH, Grace AA, Le Marec H, Wilde AA, Mohler PJ, Escande D, Abriel H, Charpentier F: Variable Na(v)1.5 protein expression from the wild-type allele correlates with the penetrance of cardiac conduction disease in the Scn5a(+/-) mouse model. PLoS One. 2010 Feb 19;5(2):e9298. doi: 10.1371/journal.pone.0009298. [PubMed:20174578 ]
  6. Hoogendijk MG, Potse M, Linnenbank AC, Verkerk AO, den Ruijter HM, van Amersfoorth SC, Klaver EC, Beekman L, Bezzina CR, Postema PG, Tan HL, Reimer AG, van der Wal AC, Ten Harkel AD, Dalinghaus M, Vinet A, Wilde AA, de Bakker JM, Coronel R: Mechanism of right precordial ST-segment elevation in structural heart disease: excitation failure by current-to-load mismatch. Heart Rhythm. 2010;7(2):238-48. doi: 10.1016/j.hrthm.2009.10.007. Epub 2009 Oct 12. [PubMed:20022821 ]