(S,S)-2,2-dimethyl-4-[(tert-butyldimethylsilyloxy)methyl]-5-vinyl-1,3-dioxolane

(3Z,9E)-(1R,7S,11S,15S,17R)-7-((E)-(S)-3-Cyclohexyl-1-hydroxy-allyl)-11-methoxymethoxy-15-methyl-13-methylene-6,21-dioxa-bicyclo[15.3.1]henicosa-3,9,19-trien-5-one