(R)-5-[(tert-butyldiphenylsilyl)oxy]-4-ethyl-1-pentanol

(2S,3S,4S,5R,6R,8S,9S)-3,5,9-trimethyl-8-[(R)-2-(tert-butyldimethylsiloxy)-1-propyl]-2-[(R,E)-3-ethyl-5-iodo-4-pentene]-1,7-dioxaspiro[5.5]undecan-4-ol