(2Z)-2-[1-hydroxy-methylidene]-4,4-dimethyl-cyclohexanone

4,4-dimethyl-2-(hydroxymethylene)-3-(2-oxopropyl)cyclohexanone

ethyl 3-(2-ethoxycarbonylmethyl-2-hydroxy-3,3-dimethylcyclohexyl)propanoate

8,8-dimethyl-10-(ethoxycarbonyl)-Δ1(9),3-2-hexalone