112518-03-3 3(2H)-Pyridazinone, 4,5-dihydro-6-(4-chlorophenyl)-2-(6-methyl-2-benzothiazolyl)- 4,5-Dihydro-6-(4-chlorophenyl)-2-(6-methyl-2-benzothiazolyl)-3(2H)-pyridazinone