Kojic acid
A pyranone that is 4H-pyran substituted by a hydroxy group at position 5, a hydroxymethyl group at position 2 and an oxo group at position 4. It has been isolated from the fungus Aspergillus oryzae. — ChEBI
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Identity & molecular properties
Source-linked values| CAS number | 501-30-4 | ChEBI ↗ |
| Molecular formula | C6H6O4 | ChEBI ↗ |
| Molar mass | 142.11 g/mol | ChEBI ↗ |
| Monoisotopic mass | 142.02661 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:43572 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 142.11 g/mol | PubChem ↗ |
| Exact mass | 142.02660867 Da | PubChem ↗ |
| Computed XLogP | -0.9 | PubChem ↗ |
| Topological polar surface area (Ų) | 66.8 | PubChem ↗ |
| H-bond donors | 2 | PubChem ↗ |
| H-bond acceptors | 4 | 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
Copy any identifierkojic acid5-hydroxy-2-(hydroxymethyl)-4H-pyran-4-oneBEJNERDRQOWKJM-UHFFFAOYSA-NO=c1cc(CO)occ1OInChI=1S/C6H6O4/c7-2-4-1-5(8)6(9)3-10-4/h1,3,7,9H,2H2Names & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
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 massUses 142.11 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsCOHCalculated 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 associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
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.