Warfarin
A racemate comprising equal amounts of (R)- and (S)-warfarin. Extensively used as both an anticoagulant drug and as a pesticide against rats and mice. — ChEBI
Safety documents & references
2 indexed referencesFind a product-specific SDS
Safety guides and government classification records are not a manufacturer’s SDS. Match supplier, product number, concentration, physical form, region and revision before using a document.
Identity & molecular properties
Source-linked values| CAS number | 81-81-2 | ChEBI ↗ |
| Molecular formula | C19H16O4 | ChEBI ↗ |
| Molar mass | 308.333 g/mol | ChEBI ↗ |
| Monoisotopic mass | 308.10486 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:10033 | ChEBI ↗ |
Names & structural identifiers
Copy any identifierwarfarinrac-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2H-1-benzopyran-2-oneNames & 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.
Safety classification · Japan
NITE / Japanese governmentWarfarin · R07-B-020-JNIOSH, MOE
| Endpoint | Reported classification |
|---|---|
| Acute toxicity （Oral） | Category 2 |
| Acute toxicity （Dermal） | Category 1 |
| Acute toxicity （Inhalation: Dusts and mists） | Category 1 |
| Reproductive toxicity | Category 1A, Additional category: Effects on or via lactation |
| Specific target organ toxicity - Single exposure | Category 1 (blood system) |
| Specific target organ toxicity - Repeated exposure | Category 1 (blood system, skin) |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 308.333 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.