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Macrocyclization of a 40-residue peptide 7 prepared from native chemical ligation. Reaction conditions: 0.1 mM peptide 7, 0.2 mg/mL GST, 0.2 M phosphate, 20 mM TCEP·HCl, pH 8.0, room temperature, 2 h. LC–MS data shown are total ion currents of starting material (top chromatogram) and crude reaction mixture (bottom chromatogram); mass spectra at the highest points of the TIC peaks are shown as insets.
