5-((Acetyl)(ethoxycarbonyl)methylenamino)-4,5-dihydro-2,5-dimethyl-4-phenyl-3-furancarbonsaeure-ethylester

乙酰乙酸乙酯

ethyl 2-ethoxy-3-oxo-2-((trimethylsilyl)oxy)butanoate

1,3-丙酮二羧酸二乙酯

3-oxo-2-(triphenylphosphoranylidene-hydrazono)-butyric acid ethyl ester