(3R,4R,E)-6-iodo-4-methylhex-5-en-3-yl (2R,3S,4R,5R,6S,8R)-3-((tert-butyldimethylsilyl)oxy)-9-((tert-butyldiphenylsilyl)oxy)-5-((4-methoxybenzyl)oxy)-2,4,6,8-tetramethylnonanoate