Trichloroacetimidates can be used to activate the glycosyl donor (in this case, β-D-GalpNAc) for coupling with the peptide. This activation step makes the glycosyl donor more reactive and helps in achieving a high yield of glycosylation.
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tert-butyldimethylsilyl 2-azido-2-deoxy-4,6-O-isopropylidene-3-O-(2,3,4,6-tetra-O-benzyl-α-D-galactopyranosyl)-β-D-galactopyranoside
(3aS,4R,6R,7R,7aS)-6-Benzyloxy-4-benzyloxymethyl-2,2-dimethyl-7-((2S,3R,4S,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yloxy)-tetrahydro-[1,3]dioxolo[4,5-c]pyran
