(2S,3S,4S,5R,6R)-Methyl-6-((1R,2S,3R,4R,5R)-3-Acetoxy-4-Azido-6,8-Dioxabicyclo[3,2,1]Octan-2-Oxyyl)-4,5-Bis(Benzyloxy)-3-Hydroxytetrahydro-2H-Pyran-2-Carboxylate