(E)-(R)-4-(tert-Butyl-dimethyl-silanyloxymethyl)-hex-2-enoic acid methyl ester

(2S,3S,4S,6R,8S,9S)-3,9-dimethyl-8-{(R)-2-[(tert-butyldimethylsilyl)-oxy]-1-propyl}-2-[(R)-3-ethyl-5-(E)-iodo-4-pentenyl]-1,7-dioxaspiro[5.5]undecan-4-ol