(2R,3S,6R,7S)-6-Benzyloxy-7-(3-benzyloxy-propyl)-7-methyl-2-((2R,4aR,6S,7R,8aS)-2-phenyl-7-triethylsilanyloxy-hexahydro-pyrano[3,2-d][1,3]dioxin-6-ylmethyl)-oxepan-3-ol