(2R,3S,6R)-3-[(tert-butyldimethylsilyl)oxy]-6-[(tert-butyldimethylsilyl)oxymethyl]-2-methyloctanal

(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