5-methoxycarbonylpentyl (3-O-acetyl-4-azido-2-O-benzyl-4,6-dideoxy-α-D-mannopyranosyl)-(1->3)-(4-azido-2-O-benzyl-4,6-dideoxy-α-D-mannopyranosyl)-(1->2)-(4-azido-3-O-benzyl-4,6-dideoxy-α-D-mannopyranosyl)-(1->3)-(4-azido-2-O-benzyl-4,6-dideoxy-... 以94%的产率得到5-methoxycarbonylpentyl (4-azido-2-O-benzyl-4,6-dideoxy-α-D-mannopyranosyl)-(1->3)-(4-azido-2-O-benzyl-4,6-dideoxy-α-D-mannopyranosyl)-(1->2)-(4-azido-3-O-benzyl-4,6-dideoxy-α-D-mannopyranosyl)-(1->3)-(4-azido-2-O-benzyl-4,6-dideoxy-α-D-...