1,10-Phenanthroline-3-carboxylic acid, 4-hydroxy-5-methoxy- 1,10-Phenanthroline-3-carboxylic acid, 4-hydroxy-5-methoxy- (9CI) 41148-77-0 NSC 408678 Pyrido(3,2-h)quinoline-3-carboxylic acid, 4-hydroxy-5-methoxy-