SHEET /m/coumarin · PubChem CID 323 · CAS 91-64-5 · REV 2026.07
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Coumarin from source
C9H6O2 · 146.14 g/mol
2H-Chromen-2-one · 2H-1-Benzopyran-2-one · cumarin · 1,2-Benzopyrone
chemical compound
CategoryScent & aroma
Chemical familyAromatics
Fig. 1 · 2D structure RDKit
C1=CC=C2C(=C1)C=CC(=O)O2
Where you'll find it
Not yet mapped to everyday foods or products.
The dose makes the poison inferred
A reported mouse oral LD50 for Coumarin is 196 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
13.7 g
a median lethal dose scaled to 154 lb (13,720 mg)
“The dose makes the poison” is a cross-species estimate shown as neutral science, not a threshold anyone should act on. Real toxicity depends on the person, not body mass alone.
Toxicity & hazards
Toxicity · LD50
196 mg/kg · moderately toxic · LD50 mouse oral from source
The dose lens above scales this to a body weight.
4 more reported values
- 202 mg/kgLD50 · oral · guinea pig
- 293 mg/kgLD50 · oral · rat
- 220 mg/kgLD50 · other · mouse
- 242 mg/kgLD50 · other · mouse
DangerToxicIrritantHealth hazardH301, H302, H317, H373from source