Synthetic or naturally occurring substances related to coumarin, the delta-lactone of coumarinic acid.

Synonyms: Derivative, Coumarin, Benzopyran 2 ones, 1,2-Benzo-Pyrones, Coumarin Derivative, Coumarins, 1,2 Benzopyrones, 1,2 Benzo Pyrones, 0, Coumarin Derivatives, Benzopyran-2-ones, 1,2-Benzopyrones, 1,2 Benzopyrone Derviatives, Coumarine, Coumarines, Derivatives, Coumarin, 1,2-Benzopyrone Derviatives, Derviatives, 1,2-Benzopyrone