Scheme 6. Cassette Approach Employed for Incorporation of the O-Linked Glycans on Solid Support (A) and Synthesis of Glycopeptide Fragment 5: β-hCG(Ac3-GalNAc)4[C110–Q145] Bearing N-acetylgalactosamine (GalNAc) at the Four O-Glycosylation Sites (B).
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