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CD spectra of peptides with (2S,4R)-Hyp(C4F9) (red circles) and (2S,4S)-hyp(C4F9) (blue squares) as the guest (X) residue in Ac-GPPXPPGY-NH2 peptides. Polyproline helix (PPII) is indicated by the magnitude of the positive band at ∼228 nm.59 The peptide with X = Pro exhibits an intermediate structure between the perfluoro-tert-butyl hydroxyprolines.55
