Dimethyl dithiophosphoric acid756-80-9100 % similar Diethyl dithiophosphoric acid298-06-643 % similar Ammonium diethyl dithiophosphate1068-22-038 % similar O,O-Dimethyl phosphoramidothioate17321-47-036 % similar Dimethyl chlorothiophosphate2524-03-036 % similar