methyl O-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)-(1->3)-(4,6-O-benzylidene-2-acetamido-2-deoxy-(β-D-glucopyanosyl)-(1->4)-(2,3-di-O-benzyl-6-O-(4-methoxybenzyl)-β-D-glucopyranoside)