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Standard conditions with peptide 2: substrate (1 equiv), 2 (10 mol %), 4-dimethylaminopyridine (10 mol %), aqueous H2O2 (3 wt %; 2.0 equiv), N,N′-diisopropylcarbodiimide (3.0 equiv), chloroform (0.033 M), 4 °C, mixing @ 30 rpm, 24 h. bAverage from two trials; determined by uncalibrated HPLC integrations of the crude reaction media (see Supporting Information for details).
