N-allyl-N-[2-(2-azido-ethoxy)-6-benzyloxymethyl-4-[3,5-bis-allyloxy-6-allyloxymethyl-4-(4-methoxy-benzyloxy)-tetrahydro-pyran-2-yloxy]-5-(3,4,5-tris-benzyloxy-6-methyl-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-3-yl]-acetamide