3-(Mercaptomethyl)-1,3,4-oxadiazol-2(3H)-one O,O-dimethyl phosphorodithioate 42565-17-3 Phosphorodithioic acid, O,O-dimethyl ester, S-ester with 3-(mercaptomethyl)-1,3,4-oxadiazol-2(3H)-one