Fondaparinux intermediate

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-id