METHYL O-(6-O-ACETYL-2-AZIDO-3,4-DI-O-BENZYL-2-DEOXY-ALPHA-D-GLUCOPYRANOSYL)-(1->4)-O-(METHYL 2,3-DI-O-BENZYL-BETA-D-GLUCOPYRANOSYLURONATE)-(1->4)-O-(3,6-DI-O-ACETYL-2-AZIDO-2-DEOXY-ALPHA-D-GLUCOPYRANOSYL)-(1->4)-O-(METHYL 2-O-ACETYL-3-O-BENZYL-ALPHA-L-