(2R,4S,6R,8R,10S)-10-(tert-Butyl-dimethyl-silanyloxy)-2-[(R)-4-(tert-butyl-dimethyl-silanyloxy)-3-methyl-2-methylene-butyl]-8-(4-methoxy-benzyloxymethyl)-1,7-dioxa-spiro[5.5]undecan-4-ol

{(2S,4S,6R,8S,10S)-4-acetoxy-8-[(3R)-4-(tert-butyldimethylsilanyloxy)-3-methyl-2-methylenebutyl]-10-methyl-10-(triethylsilanyloxy)-1,7-dioxaspiro[5.5]undec-2-yl}acetic acid allyl ester

tert-butyl(((2R,4S,6R,8S,10S)-8-((E)-2-((dicyclohexylboraneyl)oxy)but-2-en-1-yl)-10-methoxy-2-(((4-methoxybenzyl)oxy)methyl)-1,7-dioxaspiro[5.5]undecan-4-yl)oxy)dimethylsilane