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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-XKAAAAKAAAAKAAGY-NH2 model α-helical peptides.56 Population of α-helix is indicated by the magnitude of the negative band at 222 nm or the ratio [θ]222/[θ]208. Data on the peptide with X = Pro are in ref (56).
