Methyl 3-amino-4-cyano-5-(methylsulphanyl)thiophene-2-carboxylate3-Amino-4-cyano-2-(methoxycarbonyl)-5-(methylsulphanyl)thiopheneMethyl 3-amino-4-cyano-5-(methylthio)thiophene-2-carboxylate3-Amino-4-cyano-5-(methylthio)thiophene-2-carboxylic acid methyl ester3-氨基-4-氰基-5-甲硫基噻吩-2-甲酸甲酯Methyl 3-amino-4-cyano-5-(methylthio)thiophene-2-carboxylate