Coumarin Subtypes Structural features Examples Simple Coumarins Hydrolylated, alkoxylated or alkylated benzene ring Coumarin 4-hydroxycoumarin Furanocoumarins Furan ring attached to benzene ring Psoralen Angelicin Pyranocoumarins Pyran ring attached to benzene ring Seselin Xanthylein Pyrone-Substituted Coumarins Substitution on pyrone ring Warfarin

Table 1: Classification of Coumarin, its structural features and examples.