dimethoxy-(2-methylsulfanylethoxy)-sulfanylidene-λ<sup>5</sup>-phosphane, O,O-dimethyl O-[2-(methylsulfanyl)ethyl] phosphorothioate, Demephion-O, O,O-dimethyl O-2-methylthioethyl phosphorothioate, O,O-dimethyl O-[2-(methylthio)ethyl] phosphorothioate, Caswell No. 369, EINECS 211-666-9