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Structures of the synthesized Arixtra-like heptamer before (A) and after (B) the derivatizations. Two black arrows indicated the different behavior during the derivatization between GlcNS6S and GlcNS6S3S residues, which was interpreted from the MS/MS spectra and the comparison between theoretical and observed m/z values for each glycosidic bond cleavage fragment as obtained from a Synapt G2 HDMS Q-TOF (C).
