methyl O-(2-acetamido-4-O-acetyl-3,6-di-O-benzyl-2-deoxy-β-D-galactopyranosyl)-(1->4)-(methyl 2-O-benzoyl-3-O-benzyl-α-L-idopyranosyluronate)-(1->3)-2-acetamido-6-O-benzyl-2-deoxy-4-O-pivaloyl-β-D-galactopyranoside