1H,5H,11H-(1)Benzopyrano(6,7,8-ij)quinolizine-10-carboxylic acid, 2,3,6,7-tetrahydro-11-oxo-, ethyl ester 55804-66-5 75496-02-5 CCRIS 4963 Coumarin 504 EINECS 259-825-1 Ethyl 2,3,6,7-tetrahydro-11-oxo-1H,5H,11H-(1)benzopyrano(6,7,8-ij)quinolizine-10-carboxylate NSC 338967