Benzoic acid (2R,3S,5R,6S)-2-[(2S,3R,4S,5R,6R)-6-((2S,3R,4S,5R,6R)-6-acetoxymethyl-3,4,5-tris-benzyloxy-tetrahydro-pyran-2-yloxymethyl)-3,4,5-tris-benzyloxy-tetrahydro-pyran-2-yloxymethyl]-5-benzyloxy-6-methoxy-tetrahydro-pyran-3-yl ester