51356-17-3 6-Chloro-2-(mercaptomethyl)-3(2H)-pyridazinone O,O-diisopropyl phosphorodithioate BRN 0678148 Phosphorodithioic acid, O,O-diisopropyl ester, S-ester with 6-chloro-2-(mercaptomethyl)-3(2H)-pyridazinone