2-氯恶唑-4-羧酸乙酯

2-溴唑-4-羧酸乙酯

ethyl 2-acetamido-1,3-oxazole-4-carboxylate

2-乙烯基噁唑-4-羧酸乙酯

ethyl 2-pyridin-2-yl-1,3-oxazole-4-carboxylate