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

[4-acetoxy-8-(2-{2-acetoxy-5-[10-(tert-butyl-dimethyl-silanyloxy)-8-formyl-4-methoxy-1,7-dioxa-spiro[5.5]undec-2-yl]-1,3-dimethyl-4-oxo-pentyl}-allyl)-10-methyl-10-triethylsilanyloxy-1,7-dioxa-spiro[5.5]undec-2-yl]-acetic acid allyl ester

Toluene-4-sulfonic acid (2R,4S,6S,8S,10S)-8-[(R)-4-(tert-butyl-dimethyl-silanyloxy)-3-methyl-2-methylene-butyl]-4,10-dihydroxy-10-methyl-1,7-dioxa-spiro[5.5]undec-2-ylmethyl ester

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

{(2S,4S,6R,8S,10S)-8-[(R)-4-(tert-Butyl-dimethyl-silanyloxy)-3-methyl-2-methylene-butyl]-4,10-dihydroxy-10-methyl-1,7-dioxa-spiro[5.5]undec-2-yl}-acetonitrile