2,4-二甲基-5-乙氧羰基-3-吡咯甲酸

ethyl (3Z)-2-acetamido-3-(phenylhydrazinylidene)butanoate

alpha-(乙酰基氨基)乙酰基乙酸乙酯

ethyl 2-(4-fluorophenyl)-5-methyl-1,3-oxazole-4-carboxylate