"Unlabelled phorate and terbufos were purified by Florisil column chromatography according to the method of Patchett and Batchelder."
phosphorodithioate organothiophosphate organophosphate organophosphorothioate phosphinate organophosphofluoridate phosphonodithioate phosphonothioate ethoprop phosphinite
and in sulfoxide was sulfone at is or