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

5-(methoxycarbonyl)methyl-2,3-dimethyl-2-cyclopentenone

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

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

beta-allylethyl alcohol