4-(2-azido-5-chlorophenyl)-2-methyl-6-nitropyridazin-3(2H)-one

6-amino-4-chloro-5-cyano-2-methyl-7H-pyrrolo[2,3-c]pyridazin-3(2H)-one

4-chloro-2-methyl-5,6-dinitropyridazin-3(2H)-one

4,5-dichloro-6-hydroxyamino-2-methylpyridazin-3(2H)-one

4-(2-aminophenyl)-2-methyl-6-nitropyridazin-3(2H)-one