Kynurenic acid
A quinolinemonocarboxylic acid that is quinoline-2-carboxylic acid substituted by a hydroxy group at C-4. — ChEBI
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Identity & molecular properties
Source-linked values| CAS number | 492-27-3 | ChEBI ↗ |
| Molecular formula | C10H7NO3 | ChEBI ↗ |
| Molar mass | 189.17 g/mol | ChEBI ↗ |
| Monoisotopic mass | 189.04259 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:18344 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 189.17 g/mol | PubChem ↗ |
| Exact mass | 189.042593085 Da | PubChem ↗ |
| Computed XLogP | 1.3 | PubChem ↗ |
| Topological polar surface area (Ų) | 66.4 | 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 identifierkynurenic acid4-hydroxyquinoline-2-carboxylic acidHCZHHEIFKROPDY-UHFFFAOYSA-NO=C(O)c1cc(O)c2ccccc2n1InChI=1S/C10H7NO3/c12-9-5-8(10(13)14)11-7-4-2-1-3-6(7)9/h1-5H,(H,11,12)(H,13,14)Names & 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 189.17 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsCONHCalculated 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.