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. Author manuscript; available in PMC: 2017 Jun 26.
Published in final edited form as: Angew Chem Int Ed Engl. 2010 Oct 25;49(44):8195–8200. doi: 10.1002/anie.201000892

Scheme 2.

Scheme 2

Preparation of N-glycan clusters through histidine-accelerated CuI-mediated Huisgen 1,3-dipolar cycloaddition and labeling by 6π-azaelectrocyclization. Bn=benzyl.