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

4-(5-chloro-2-pivaloylaminophenyl)-2-methyl-6-nitropyridazin-3(2H)-one

6-amino-5-chloro-4-(4-methoxyphenoxy)-2-methyl-2H-pyridazin-3-one

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

4-chloro-6,7-dihydro-2-methyl-2H-pyridazino<4,5-b><1,4>oxazin-3(5H)-one