5-ethoxy-3-oxopentanoic acid

4-乙氧基-2-丁酮

ethyl 4a,7,7-trimethyl-2-oxo-4,5,6,8-tetrahydro-3H-naphthalene-1-carboxylate

(乙氧基羰基甲基)三苯基氯化膦

ethyl 5-ethoxy-3-oxo-2-(triphenylphosphoranylidene)pentanoate