methyl 4-O-acetyl-2-azido-3-O-{2-azido-3-O-benzyl-4-O-(2-acetamido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-β-D-glucopyranosyl)-6-O-tert-butyldimethylsilyl-2-deoxy-β-D-mannopyranosyl}-6-O-tert-butyldiphenylsilyl-2-deoxy-β-L-galactopyranoside