ethyl 2-(3-hydroxy-4-methylanilino)-1,3-thiazole-4-carboxylate

ethyl 2-(3-hydroxy-4-methoxyanilino)-1,3-thiazole-4-carboxylate

2-乙烯基噁唑-4-羧酸乙酯

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

ethyl 2-butyl-1,3-thiazole-4-carboxylate