((6-Hydroxy-5-benzofuranyl)methylene)malonic acid, gamma-lactone, ethyl ester 20073-24-9 3-CARBETHOXYPSORALEN 3-CPs 3-Ethoxycarbonylpsoralen 5-19-08-00079 (Beilstein Handbook Reference) 7-Oxo-7H-furo(3,2-g)(1)benzopyran-6-carboxylic acid ethyl ester 7H-Furo(3,2-g)(1)benzopyran-6-carboxylic acid, 7-oxo-, ethyl ester BRN 0278285 EINECS 243-498-7 Ethyl 3-psoralencarboxylate Ethyl 7-oxo-7H-furo(3,2-g)(1)benzopyran-6-carboxylate