(2R,4aR,6R,7S,8aR,9aS,10aS)-6-(tert-Butyl-dimethyl-silanyloxy)-7-[(R)-3-(tert-butyl-dimethyl-silanyloxy)-2-methyl-propyl]-10a-methyl-2-phenyl-octahydro-1,3,8,10-tetraoxa-anthracene

9-[7-benzyloxy-6-(2-benzyloxy-ethyl)-2,6,8a-trimethyl-2-vinyl-octahydro-pyrano[3,2-b]pyran-3-yloxy]-5a,10-dimethyl-2-phenyl-8-vinyl-dodecahydro-1,3,5,7,12-pentaoxa-cyclohepta[b]anthracene