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Modifications to thioether linkages. (A) Glutathione S-Transferase catalyzes SNAr reactions to give fluorophenyl thioethers. (B) Addition of biphenyl linker to thiols gives biphenyl thioether. (C) Bis-alkylation of methionine gives sulfonium-linked peptides. (D) Alkylation of diselenocysteine peptides gives diselenoether constrained peptides.
