Figure 4.
(A) Stepwise modification of model peptide 4. (a) CPM, 3 h RT. (b) TCEP, 30 min; CPM, 3 h at RT. Both reactions were accomplished in acetonitrile: phosphate buffer (1:1), pH 7.4 mixture. (B) MALDI-MS spectrum of 5 and (C) 6.
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