ethyl 2-amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylateEthyl 2-amino-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate2-Amino-4,5,6,7-tetrahydro-benzo[b]thiophene-3-carboxylic acid ethyl esterEthyl 2-amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate2-氨基-4,5,6,7-四氢苯并[b]噻酚-3-羧酸乙酯