1,2-Benzopyrone 2-Propenoic acid, 3-(2-hydroxyphenyl)-, delta-lactone 2H-1-Benzopyran-2-one 5,6-Benzo-2-pyrone 91-64-5 Benzo-alpha-pyrone C05851 Coumarin Coumarine Coumarinic anhydride Cumarin Rattex Tonka bean camphor cis-o-Coumarinic acid lactone o-Hydroxycinnamic acid lactone