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

(2S,4S,6S,8R,10S)-2-[(R)-4-(tert-Butyl-dimethyl-silanyloxy)-3-methyl-2-methylene-butyl]-8-hydroxymethyl-4-methyl-1,7-dioxa-spiro[5.5]undecane-4,10-diol

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

{(2R,4S,6S,8S,10S)-4-Acetoxy-8-[(R)-4-(tert-butyl-dimethyl-silanyloxy)-3-methyl-2-methylene-butyl]-10-hydroxy-10-methyl-1,7-dioxa-spiro[5.5]undec-2-yl}-acetic acid allyl ester

{(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