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Chemical structures of the targeted tryptic Fc fragments from Herceptin (human IgG1 antibody) representing IgG1 Fc glycopeptide 1 modified with one of the scarce nonfucosylated and bisected decasaccharide (a bisected G2), and its nonbisected counterpart 2 having a biantennary nonasaccharide (a biantennary G2) listed in Figure 1.
