12-Oxo-12H-quino(2,1-b)quinazoline-5-carboxylic acid 12H-Quino(2,1-b)quinazoline-5-carboxylic acid, 12-oxo- 137522-63-5 BRN 5442804 Quinolino(2,1-b)quinazolin-12-one-5-carboxylic acid