benzyl 3-O-<3-O-(4-O-acetyl-2,6-dideoxy-2-iodo-3-C-methyl-α-L-mannopyranosyl)-4-O-acetyl-2,6-dideoxy-β-D-arabino-hexopyranosyl>-4-O-benzoyl-2,6-dideoxy-β-D-arabino-hexopyranoside