Chemical substance record

Kaempferol

520-18-3C₁₅H₁₀O₆286.239 g/mol

Organic/Inorganic Small MoleculeChEBI source record

A tetrahydroxyflavone in which the four hydroxy groups are located at positions 3, 5, 7 and 4'. Acting as an antioxidant by reducing oxidative stress, it is currently under consideration as a possible cancer treatment. — ChEBI

Safety references

Safety documents & references

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Identity & molecular properties

Source-linked values

CAS number	520-18-3	ChEBI ↗
Molecular formula	C₁₅H₁₀O₆	ChEBI ↗
Molar mass	286.239 g/mol	ChEBI ↗
Monoisotopic mass	286.04774 Da	ChEBI ↗
Formal charge	0	ChEBI ↗
ChEBI identifier	CHEBI:28499	ChEBI ↗

Cross-source molecular data

PubChem

Molar mass	286.24 g/mol	PubChem ↗
Exact mass	286.04773803 Da	PubChem ↗
Computed XLogP	1.9	PubChem ↗
Topological polar surface area (Å²)	107	PubChem ↗
H-bond donors	4	PubChem ↗
H-bond acceptors	6	PubChem ↗
Rotatable bonds	1	PubChem ↗

PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.

Names & structural identifiers

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Source preferred name

kaempferol

IUPAC name

3,5,7-trihydroxy-2-(4-hydroxyphenyl)-4H-chromen-4-one

InChIKey

IYRMWMYZSQPJKC-UHFFFAOYSA-N

SMILES

O=c1c(O)c(-c2ccc(O)cc2)oc2cc(O)cc(O)c12

InChI

InChI=1S/C15H10O6/c16-8-3-1-7(2-4-8)15-14(20)13(19)12-10(18)5-9(17)6-11(12)21-15/h1-6,16-18,20H

Names & synonyms

3,5,7-trihydroxy-2-(4-hydroxyphenyl)-4H-chromen-4-one

Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.

Classification & relationships

ChEBI ontology

flavonolsChEBI parent class · 28802 ↗tetrahydroxyflavoneChEBI parent class · 38684 ↗7-hydroxyflavonolChEBI parent class · 52267 ↗

organic molecular entity

Roles recorded in ChEBI

geroprotectorantibacterial agentplant metabolitehuman xenobiotic metabolitehuman urinary metabolitehuman blood serum metabolite

Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.

Mass ↔ amount of substance

Calculated from sourced mass

Amount

Input unit

Equivalent amount

0.00349358 mol

Uses 286.239 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.

Elemental composition

Theoretical mass fractions

C

Carbon · 15 atoms

62.94%

O

Oxygen · 6 atoms

33.54%

H

Hydrogen · 10 atoms

3.52%

Calculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.

Research & patent references

Selected source associations

The metabolism of dietary polyphenols and the relevance to circulating levels of conjugated metabolites. ↗Free radical research · 2002 Nov · PMID 12592675

Biological activity of five antibacterial flavonoids from Combretum erythrophyllum (Combretaceae). ↗Journal of ethnopharmacology · 2004 Aug · PMID 15234754

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Sources & record history

Checked 27 Sep 2026

Identity, formula, mass, synonyms & ontologyEMBL-EBI ChEBI · CHEBI:28499

Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0

Additional molecular descriptorsNCBI PubChem · CID 5280863 · retrieved 2026-09-27

PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.

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