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The SAR study on a phage library-derived non-phosphorylated cyclic peptide ligand of Grb2-SH2 domain indicates that the configuration of the cyclization linkage is crucial for assuming the active binding conformation. When the thioether linkage was oxidized to the two chiral sulfoxides, the R-configured sulfoxide-cyclized peptide displayed 10–30 times more potency than the corresponding S-configured...
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