4-Nitrophenyl isothiocyanate has been used in the synthesis of: . 5,6-dimethyl-2-[(4-nitrophenyl)amino]thieno[2,3-d]pyrimidin-4(3H)-one . 4,5-dimethyl-2-substituted carbamothioylaminothiophene-3-carboxamides . acyclic triazene or zwitterionic dihydropyrimidinium imidothiolate derivatives 4-Nitrophenyl isothiocyanate has been used in the synthesis of: . 5,6-dimethyl-2-[(4-nitrophenyl)amino]thieno[2,3-d]pyrimidin-4(3H)-one . 4,5-dimethyl-2-substituted carbamothioylaminothiophene-3-carboxamides . acyclic triazene or zwitterionic dihydropyrimidinium imidothiolate derivatives