Methanol Thiophene-3,4-dicarboxylic acid 2-NITROTHIOPHENE-4-CARBOXYLIC ACID METHYL 3-AMINOTHIOPHENE-4-CARBOXYLATE HYDROCHLORIDE ETHYL 2-AMINO-5-ETHYLTHIOPHENE-3-CARBOXYLATE 4-METHOXYTHIOPHENE-3-CARBOXYLIC ACID ETHYL 2-AMINO-4-METHYLTHIOPHENE-3-CARBOXYLATE DIETHYL 5-AMINO-3-METHYL-2,4-THIOPHENEDICARBOXYLATE 2-Thiophenemethanol METHYL 4-[(4-CHLOROPHENYL)THIO]THIOPHENE-3-CARBOXYLATE