Acetic acid (2R,4S,6S,8S,10S)-8-[(R)-4-(4-methoxy-benzyloxy)-3-methyl-2-methylene-butyl]-10-methyl-2-(2-oxo-ethyl)-10-triethylsilanyloxy-1,7-dioxa-spiro[5.5]undec-4-yl ester

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

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