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Preferred intramolecular H-bond/β-turn patterns proposed for peptidomimetics 8 and 9 based on spectroscopic data. The arrows indicate significant NOE contacts. Type I H-bonding pattern, Gly-Asp β-turn motif. Type II H-bonding pattern, Arg-Gly β-turn motif (the pattern definition is consistent with that previously reported for other cyclic RGD pentapeptide mimics) [28].
