Synonyms: NSC51342;6344-85-0;2-[(4-chlorophenyl)amino]-6,7-dihydropyrimido[4,5-d]pyridazine-5,8-dione;2-(4-Chloroanilino)pyrimido(4,5-d)pyridazine-5,8-diol;2-(4-Chloroanilino)pyrimido[4,5-d]pyridazine-5,8-diol;AC1L69SH;AC1Q3O30;AR-1D5859;NSC 51342;NSC-51342;2-(4-chloroanilino)-6,7-dihydropyrimido[4,5-d]pyridazine-5,8-dione