Record Information
Creation date2010-04-08 22:06:47 UTC
Update date2019-11-26 03:00:42 UTC
Primary IDFDB005672
Secondary Accession NumbersNot Available
Chemical Information
FooDB Name(-)-Kaur-16-en-19-oic acid
Description(-)-kaur-16-en-19-oic acid, also known as ent-kaurenoic acid or ent-kaur-16-en-19-oate, is a member of the class of compounds known as kaurane diterpenoids. Kaurane diterpenoids are diterpene alkaloids with a structure that is based on the kaurane skeleton. Kaurane is a tetracyclic compound that arises by cyclisation of a pimarane precursor followed by rearrangement. It possesses a [3,2,1]-bicyclic ring system with C15-C16 bridge connected to C13, forming the five-membered ring D (-)-kaur-16-en-19-oic acid is practically insoluble (in water) and a weakly acidic compound (based on its pKa). (-)-kaur-16-en-19-oic acid can be found in sugar apple and sunflower, which makes (-)-kaur-16-en-19-oic acid a potential biomarker for the consumption of these food products.
CAS Number6730-83-2
(5beta,8alpha,9beta,10alpha,13alpha)-Kaur-16-en-18-Oic acidChEBI
ent-Kaur-16(17)-en-19-Oic acidChEBI
ent-Kaurenoic acidChEBI
Kaur-16-en-18-Oic acidChEBI
Kauren-19-Oic acidChEBI
Kaurenic acidChEBI
Kaurenoic acidChEBI
ent-Kaur-16-en-19-Oic acidKegg
(5b,8a,9b,10a,13a)-Kaur-16-en-18-Oic acidGenerator
(5Β,8α,9β,10α,13α)-kaur-16-en-18-Oic acidGenerator
(-)-Kaur-16-en-19-Oic acidChEBI
ent-Kaur-16-en-18-Oic acidMeSH
3beta-Hydroxy-kaurenoic acidMeSH
Predicted Properties
Water Solubility0.00048 g/LALOGPS
pKa (Strongest Acidic)4.84ChemAxon
Physiological Charge-1ChemAxon
Hydrogen Acceptor Count2ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area37.3 ŲChemAxon
Rotatable Bond Count1ChemAxon
Refractivity87.36 m³·mol⁻¹ChemAxon
Polarizability35.32 ųChemAxon
Number of Rings4ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Chemical FormulaC20H30O2
IUPAC name(1S,4S,5R,9S,10R,13R)-5,9-dimethyl-14-methylidenetetracyclo[^{1,10}.0^{4,9}]hexadecane-5-carboxylic acid
InChI IdentifierInChI=1S/C20H30O2/c1-13-11-20-10-7-15-18(2,16(20)6-5-14(13)12-20)8-4-9-19(15,3)17(21)22/h14-16H,1,4-12H2,2-3H3,(H,21,22)/t14-,15+,16+,18-,19-,20-/m1/s1
Isomeric SMILES[H][C@@]12C[C@]3(CC1=C)CC[C@]1([H])[C@@](C)(CCC[C@@]1(C)[C@]3([H])CC2)C(O)=O
Average Molecular Weight302.458
Monoisotopic Molecular Weight302.224580206
Description belongs to the class of organic compounds known as kaurane diterpenoids. These are diterpene alkaloids with a structure that is based on the kaurane skeleton. Kaurane is a tetracyclic compound that arises by cyclisation of a pimarane precursor followed by rearrangement. It possesses a [3,2,1]-bicyclic ring system with C15-C16 bridge connected to C13, forming the five-membered ring D.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassPrenol lipids
Sub ClassDiterpenoids
Direct ParentKaurane diterpenoids
Alternative Parents
  • Kaurane diterpenoid
  • Monocarboxylic acid or derivatives
  • Carboxylic acid
  • Carboxylic acid derivative
  • Organic oxygen compound
  • Organic oxide
  • Hydrocarbon derivative
  • Organooxygen compound
  • Carbonyl group
  • Aliphatic homopolycyclic compound
Molecular FrameworkAliphatic homopolycyclic compounds
External Descriptors
OntologyNo ontology term
Physico-Chemical Properties - Experimental
Physico-Chemical Properties - Experimental
Physical stateNot Available
Physical DescriptionNot Available
Mass CompositionNot Available
Melting PointNot Available
Boiling PointNot Available
Experimental Water SolubilityNot Available
Experimental logPNot Available
Experimental pKaNot Available
Isoelectric pointNot Available
ChargeNot Available
Optical RotationNot Available
Spectroscopic UV DataNot Available
DensityNot Available
Refractive IndexNot Available
Spectrum TypeDescriptionSplash KeyView
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0udi-0189000000-e32ee1de5a9c608c2a44JSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0a4r-0391000000-e394ed814c12150daac8JSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-00kr-4980000000-a62048379e0c65cfa374JSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0udi-0049000000-7e4d4b429d5eff18ab7eJSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-0pb9-0094000000-8f1bdf9553eed92d0c8cJSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-052o-1090000000-0d495a6257dc2d019e9cJSpectraViewer
ChemSpider IDNot Available
ChEMBL IDNot Available
KEGG Compound IDNot Available
Pubchem Compound IDNot Available
Pubchem Substance IDNot Available
ChEBI IDNot Available
Phenol-Explorer IDNot Available
DrugBank IDNot Available
HMDB IDNot Available
CRC / DFC (Dictionary of Food Compounds) IDNot Available
EAFUS IDNot Available
Dr. Duke ID(-)-KAUR-16-EN-19-OIC-ACID
BIGG IDNot Available
KNApSAcK IDNot Available
HET IDNot Available
Food Biomarker OntologyNot Available
VMH IDNot Available
Flavornet IDNot Available
GoodScent IDNot Available
SuperScent IDNot Available
Wikipedia IDNot Available
Phenol-Explorer Metabolite IDNot Available
Duplicate IDSNot Available
Old DFC IDSNot Available
Associated Foods
FoodContent Range AverageReference
Biological Effects and Interactions
Health Effects / Bioactivities
anti septic33281 A substance that kills or slows the growth of microorganisms, including bacteria, viruses, fungi and protozoans.DUKE
pesticide25944 Strictly, a substance intended to kill pests. In common usage, any substance used for controlling, preventing, or destroying animal, microbiological or plant pests.DUKE
EnzymesNot Available
PathwaysNot Available
MetabolismNot Available
BiosynthesisNot Available
Organoleptic Properties
FlavoursNot Available
MSDSNot Available
Synthesis ReferenceNot Available
General ReferenceNot Available
Content Reference— Duke, James. 'Dr. Duke's Phytochemical and Ethnobotanical Databases. United States Department of Agriculture.' Agricultural Research Service, Accessed April 27 (2004).