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Another pair of glycan isomers (m/z 1268, [M + Na]+) from HPLC (A) F39 and (B) F46 was structurally differentiated by IRMPD tandem MS. The fragmentation patterns and assigned structures of the isomers are shown. The inset spectrum in (A) shows the core-2 fingerprint from another shot of IRMPD of the sample.
