4-吗啉丙酸 b-氧代-乙酯

3-[N-(苯基)氨基]-3-氧代丙酸乙酯

ethyl 3-[(2-ethoxy-2-oxoethyl)amino]-3-oxopropanoate

ethyl 3-(ethylamino)-3-oxopropanoate

1-diazonio-4-ethoxy-4-oxobut-1-en-2-olate