6,7,8-trimethyl-7-vinyl-1,4-dioxaspiro<4.5>decane

7-formyl-6,7,8-trimethyl-1-4-dioxaspiro<4.5>decane

7-<4'-ethoxycarbonyl-3'-methyl-1',3'-butadienyl>-6,7,8-trimethyl-1,4-dioxaspiro<4.5>decane