12H-Quino(2,1-b)quinazoline-5-carboxylic acid, 12-oxo-, ethyl ester 137522-64-6 BRN 5446764 Ethyl 12-oxo-12H-quino(2,1-b)quinazoline-5-carboxylate Ethyl quinolino(2,1-b)quinazolin-12-one-carboxylate