(4aR,5R,7S,8aR)-5-(tert-Butyl-diphenyl-silanyloxy)-7-hydroxy-7-[2-methyl-2-((2S,3S,4R,5R,6S)-3,4,5-tris-benzyloxy-6-methyl-tetrahydro-pyran-2-yloxy)-propoxymethyl]-hexahydro-benzo[1,4]dioxin-2-one