what is coumarin
Coumarin (/ËkuËmÉrÉªn/ ; 2H-chromen-2-one) is a fragrant organic chemical compound in the benzopyrone chemical class, which is a colorless crystalline substance in its standard state. It is a natural substance found in many plants.oumarin is moderately toxic to the liver and kidneys, with a median lethal dose (LD 50) of 275 mg/kg, a low toxicity compared to related compounds. Though it is only somewhat dangerous to humans, coumarin is hepatotoxic in rats, but less so in mice.