methyl 4-nitro-5-(phenylamino)thiophene-2-carboxylate

盐酸苯胺

5-氯-4-硝基噻吩-2-甲酸

4-氨基-5-氯噻吩-2-甲酸甲酯

methyl 4-acetamido-5-chlorothiophene-2-carboxylate