(4R,6R)-4-((R)-2-(tert-butyldimethylsilanyloxy)-3-{(2R,6S)-6-[2-(tert-butyldimethylsilanyloxy)ethyl]tetrahydropyran-2-yl}propyl)-6-((S)-3,3-dibromo-1-methylallyl)-2,2-dimethyl-[1,3]dioxane

(4R,5S)-5-tert-butyldimethylsilyloxymethyl-2,2-dimethyl-1,3-dioxolane-4-carbaldehyde