((4aS,5S,8S,8aS)-5-allyl-5,8a-dimethyl-6-methyleneoctahydro-2H-spiro[naphthalene-1,2'-[1,3]dioxolan]-8-yl)trimethylsilane

3-((4aS,5S,8S,8aS)-5,8a-dimethyl-6-methylene-8-(trimethylsilyl)octahydro-2H-spiro[naphthalene-1,2'-[1,3]dioxolan]-5-yl)propane-1,2-diol