(E)-3-[(2R,3S,5R,6S)-5-Benzyloxy-6-(2-benzyloxy-ethyl)-3-(tert-butyl-dimethyl-silanyloxy)-2,6-dimethyl-tetrahydro-pyran-2-yl]-acrylic acid methyl ester

[(2R,4R,4aS,6S,7R,8aS)-2-Allyl-7-benzyloxy-6-(2-benzyloxy-ethyl)-4a,6-dimethyl-octahydro-pyrano[3,2-b]pyran-4-yloxy]-triisopropyl-silane