1-[4-(2,4-Dichlorobenzoyl)benzyl]-2,3,5-trimethyl-1H-pyrrolo [2,3-d]pyridazin-4(5H)-one
1-[4-(4-Chlorobenzoyl)benzyl]-2,3,5-trimethyl-1H-pyrrolo [2,3-d]pyridazin-4(5H)-one
1-[4-(4-Methoxybenzoyl)benzyl]-2,3,5-trimethyl-1H-pyrrolo [2,3-d]pyridazin-4(5H)-one
1-[4-(4-Trifluoromethylbenzoyl)benzyl.]-2,3,5-trimethyl-1H-pyrrolo [2,3-d]pyridazin-4(5H)-one
1-[4-(4-Fluorobenzoyl)benzyl]-2,3,5-trimethyl-1H-pyrrolo [2,3-d]pyridazin-4(5H)-one