4-羰基己酸乙酯

5-乙基-5H-呋喃-2-酮

5-(4-甲基苯基)-3H-呋喃-2-酮

5-乙氧基-2(5H)-呋喃酮

tert-butyl (4S)-4-[(S)-hydroxy-[(2S)-5-oxo-2H-furan-2-yl]methyl]-2,2-dimethyl-1,3-oxazolidine-3-carboxylate