ethyl 4-oxo-4-piperidin-1-ylbutanoate

4-氧代-六基-5-辛烯酸乙酯

ethyl 4-oxo-4-(1H-pyrrol-2-yl)butanoate

γ-oxo-1-H-pyrrole-3-butanoic acid ethyl ester

methyl 4-oxooctanoate