{(2S,5S)-2,6-Bis-benzyloxycarbonylamino-5-[(2R,3R,4S,5R,6R)-4,5-dihydroxy-6-hydroxymethyl-3-((2R,3R,4S,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-2-yloxy]-hexanoylamino}-acetic acid