Endocide, Phosphopyrone, Exothion, S-5-methoxy-4-oxo-4H-pyran-2-ylmethyl O,O-dimethyl phosphorothioate, 2-(dimethoxyphosphorylsulfanylmethyl)-5-methoxypyran-4-one, Caswell No. 422, 2-(dimethoxyphosphorylsulfanyl-methyl)-5-methoxy-pyran-4-one, Endothion [ISO], 2-dimethoxyphosphinoylthiomethyl-5-methoxypyran-4-one, Endothion, 2-(Dimethoxyphosphorylmercapto-methyl)-5-methoxy-pyran-4-on, Niagara 5767, Phosphopyron, Endocid, Phosphate 100, S-[(5-methoxy-4-oxo-4H-pyran-2-yl)methyl] O,O-dimethyl phosphorothioate