(2S,3S,4S,5R,6R)-4,5-Bis-benzyloxy-3-(2-chloro-acetoxy)-6-((2R,3S,4R,5R)-4,6-diacetoxy-2-acetoxymethyl-5-azido-tetrahydro-pyran-3-yloxy)-tetrahydro-pyran-2-carboxylic acid methyl ester