methyl 4-acetamido-5-bromothiophene-2-carboxylate

methyl 5-acetamidothiophene-3-carboxylate

5-(乙酰氨基)噻吩-2-羧酸

ethyl 4-(acetamido)thiophene-2-carboxylate

ethyl 5-acetamidothiophene-2-carboxylate