3-ethoxycarbonyl-5-hydroxymethyl-2,3-dimethylcyclopent-2-enone

2,5-庚二酮

2-methyl-2-(3-(methylthio)pent-2-en-1-yl)-1,3-dioxolane

3-oxo-2-(2-oxo-propyl)-pentanoic acid ethyl ester

ethyl 3,4-dimethyl-2-oxocyclopent-3-ene-1-carboxylate