(2S,3R,4S,6R,8S,9S)-4-benzoyloxy-3,9-dimethyl-8-{(R)-2-[(tert-butyldimethyl-silyl)oxy]-1-propyl}-2-[(R)-3-ethyl-3-formylpropyl]-1,7-dioxaspiro[5.5]undecane

(2S,3R,4S,6R,8S,9S)-4-benzoyloxy-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]undecane

(2S,3S,4S,6R,8S,9S)-4-[(diethylphosphonoacetyl)oxy]-3,9-dimethyl-8-[(R)-2-[(tert-butyldimethylsilyl)oxy]-1-propyl]-2-[(R)-3-ethyl-5-(E)-iodo-4-pentyl]-1,7-dioxaspiro[5.5]undecane

(E)-(4S,5R,6S)-5-(tert-Butyl-dimethyl-silanyloxy)-4,6-dimethyl-7-oxo-non-2-enoic acid (2S,3R,4S,6R,8S,9S)-8-[(R)-2-(tert-butyl-dimethyl-silanyloxy)-propyl]-2-((E)-(R)-3-ethyl-5-iodo-pent-4-enyl)-3,9-dimethyl-1,7-dioxa-spiro[5.5]undec-4-yl ester