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Schematic synthesis of (a) pH-responsive UV-crosslinkable C6 O-allyl chitosan (OAL-CS) via protection/deprotection of amino groups and (b) the OAL-CS hydrogel via UV-triggered “thiol-ene” click chemistry in which 4-arm PEG-SH served as crosslinker, as designed by Ding et al. Reprinted with permission from [88]; published by Elsevier, 2020.
