{3-[(2R,3R,4S,5R)-4-((2R,3R,4S,5S,6R)-3-Benzyloxy-6-benzyloxymethyl-4,5-dihydroxy-tetrahydro-pyran-2-yloxy)-5-benzyloxymethyl-3-hydroxy-tetrahydro-furan-2-yloxy]-propyl}-carbamic acid benzyl ester