31875-40-8 BRN 0535643 O,O-Diethyl S-((5-methyl-1,3,4-oxadiazol-2-yl)methyl) phosphorodithioate Phosphorodithioic acid, O,O-diethyl S-((5-methyl-1,3,4-oxadiazol-2-yl)methyl) ester