{(2R,5R)-2,6-Bis-benzyloxycarbonylamino-5-[(2S,3S,4R,5R,6S)-4,5-diacetoxy-6-acetoxymethyl-3-((2S,3S,4R,5S,6S)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-2-yloxy]-hexanoylamino}-acetic acid tert-butyl ester