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. 2021 Apr 15;9:644811. doi: 10.3389/fchem.2021.644811

Figure 6.

Figure 6

(A) Traditional synthesis of cyclic peptide probes. (B) Schematic representation of simultaneous peptide cyclisation with a clickable benzophenone photocrosslinker (17). (C) Specific alkylation of a cysteine residue and a methionine residue to prepare cyclic probes. The sulfonium reactive group reacts with cysteine residues within the proximity of the probe binding site.