Ethyl 3-cyclopropyl-1H-pyrrole-2-carboxylate

5-苯基噁唑-4-羧酸乙酯

5-甲基噁唑-4-羧酸乙酯

ethyl 5-ethoxy-1,3-oxazole-4-carboxylate

2-[(4-甲氧基苯甲酰基)氨基]乙酸乙酯