51356-22-0 6-Chloro-2-(mercaptomethyl)-5-methyl-3(2H)-pyridazinone O,O-diisopropyl phosphorodithioate BRN 0684767 Phosphorodithioic acid, O,O-diisopropyl ester, S-ester with 6-chloro-2-(mercaptomethyl)-5-methyl-3(2H)-pyridazinone