10H-Pyridazino[6,1-b]quinazolin-10-one, 2-chloro- 1702-98-3 2-Chloropyridazino[3,2-b]quinazol-10-one 2-Chloropyridazino[6,1-b]quinazolin-10-one NSC93937 WLN: T C666 BVNN INJ EG