dibenzyl 3,4,6-tri-O-acethyl-2-deoxy-2-acetamido-β-D-glucopyranosyl-(1->4)-2-acetamido-6-O-acetyl-2-deoxy-3-O-(D-1-{[2-(phenylsulfonyl)ethoxy]carbonyl}ethyl)-α-D-glucopyranosyl phosphate