22439-38-9 AI3-25648 BRN 0671623 ENT 25,648 G-34445 Geigy G-34445 Phosphorodithioic acid, S-((3-chloro-6-oxo-1(6H)-pyridazinyl)methyl) O,O-diethyl ester Phosphorodithioic acid, S-((6-chloro-3(2H)-pyridazinon-2-yl)methyl) O,O-diethyl ester S-6-Chloro-2-(mercaptomethyl)-3(2H)-pyridazinone O,O-diethyl phosphorodithioate