33575-76-7 BRN 1081417 O,O-Diethyl S-((5-ethyl-1,3,4-oxadiazol-2-yl)methyl) phosphorodithioate Phosphorodithioic acid, O,O-diethyl S-((5-ethyl-1,3,4-oxadiazol-2-yl)methyl) ester