[(2S,3R,5S,6R)-5-Benzyloxy-6-benzyloxymethyl-2-((R)-1-benzyloxy-2-(2R,4aR,8aS)-4,4a,6,8a-tetrahydro-pyrano[3,2-d][1,3]dioxin-2-yl-ethyl)-2-methyl-tetrahydro-pyran-3-yloxy]-triisopropyl-silane