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. 2020 Dec 1;8:554732. doi: 10.3389/fchem.2020.554732

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Copyright © 2020 Tsvetkov, Paulovičová, Paulovičová, Farkaš and Nifantiev.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Scheme 3 — Transformation of the protected chito-oligomers in biotin-tagged chitosan oligosaccharides 25–27. Structures of previously synthesized chito-oligosaccharides 28–30 used in this work.