4-Chloro-2-(4-chlorophenyl)-5-((4-chlorophenyl)methoxy)-3(2H)-pyridazinone , its CAS NO. is 107359-39-7, the synonym is 3(2H)-Pyridazinone, 4-chloro-2-(4-chlorophenyl)-5-((4-chlorophenyl)methoxy)- .