Methyl 3-aminothiophene-2-carboxylate3-Amino-2-(methoxycarbonyl)thiophene3-Aminothiophene-2-carboxylic acid methyl ester3-氨基-2-噻吩甲酸甲酯Methyl 3-amino-2-thiophenecarboxylateMethyl-3-Aminothiophene-2-Carboxylate3-Aminothiophene-2-carboxylic acid methyl ester3-氨基噻吩-2-羧酸甲酯Methyl 3-amino-2-thiophenecarboxylateMethyl 3-aminothiophene-2-carboxylate