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Crystal structures of eight peptide β‐hairpins in the sequence Boc‐Leu‐Phe‐Val‐Xxx‐Yyy‐Leu‐Phe‐Val‐OMe revealed that the Phe(2) and Phe(7) aromatic rings are in close spacial proximity, with the centroid–centroid distance (Rcen) of 4.4–5.4 Å between the two phenyl rings. Proton NMR spectra in chloroform and methanol solution reveal a significant upfield shift of the Phe(7) Cδ,δ′H2 protons (6.65–7...
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