(2S,3S,4S,5R,6R)-Methyl-6-((1R,2S,3R,4R,5R)-3-Acetoxy-4-Azido-6,8-Dioxabicyclo[3,2,1]Octan-2-yloxy)-4,5-bis(benzyloxy)-3-hydroxytetrahydro-2H-pyran-2-carboxylate