1,2-Benzopyrone 2-Oxo-1,2-benzopyran 2-Propenoic acid, 3-(2-hydroxyphenyl)-, .delta.-lactone 2H-1-Benzopyran, 2-oxo- 2H-1-Benzopyran-2-one 2H-Benzo[b]pyran-2-one 91-64-5 Benzo-.alpha.-pyrone COUMARIN Cinnamic acid, o-hydroxy-, .delta.-lactone Coumarinic anhydride Cumarin NSC8774 Rattex Tonka bean camphor WLN: T66 BOVJ cis-o-Coumarinic acid lactone o-Hydroxycinnamic acid lactone o-Hydroxycinnamic lactone