Carbonic acid tert-butyl ester (S)-1-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-but-3-enyl ester

triisopropylsilyl 2-((2R,4S,6S,8S,10S)-4-acetoxy-8-((R)-4-((4-methoxybenzyl)oxy)-3-methyl-2-methylenebutyl)-10-methyl-10-((triethylsilyl)oxy)-1,7-dioxaspiro[5.5]undecan-2-yl)acetate

(2R,4S,6S,8S,10S)-(4-(t-butyldimethylsiloxy)-10-hydroxy-10-methyl-8-{2-[1-methyl-2-(triisopropylsiloxy)-ethyl]-allyl}-1,7-dioxaspiro[5.5]undec-2-yl)-acetaldehyde

(2S,4S,6R,8S,10S)-8-(2-hydroxyethyl)-10-(t-butyldimethylsiloxy)-4-methyl-2-{2-[1-(triisopropylsiloxy)-prop-2-(R)-yl]-allyl}-1,7-dioxaspiro[5.5]undecan-4-ol

2,2,2-trichloroethyl (2R,4S,6S,8S,10S)-(4-acetoxy-10-hydroxy-10-methyl-8-{2-[1-(triisopropylsiloxy)-prop-2-(R)-yl]-allyl}-1,7-dioxaspiro[5.5]undec-2-yl)-acetate