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Chemoselectivity of palladium complex 1-mediated peptide crosslinking is confirmed by mutation study. (a) Even in the presence of nucleophilic residues, no crosslink was formed in lysine-t0-leucine mutated model peptide 5 using the palladium complex 1, indicating crosslinking occurs between cysteine and lysine residues. (b) LC-MS analysis of starting material and the reaction mixture. The mass spectra for peptide 5 and 6 are shown as insets.
