2H-1-Benzopyran-2-one, 3-hydroxy- (9CI) 3-Hydroxy-2-benzopyrone 3-Hydroxy-2H-1-benzopyran-2-one 3-Hydroxycoumarin 5-18-01-00376 (Beilstein Handbook Reference) 939-19-5 BRN 0128032 COUMARIN, 3-HYDROXY- EINECS 213-355-3 NSC 74691