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19F NMR spectra of Ac-GPPXPPGY-NH2 peptides with X = (2S,4R)-Hyp(C4F9) (top) and (2S,4S)-hyp(C4F9) (bottom). The NMR spectra indicate the presence of cis–trans isomerism about the X–Pro amide bonds. The major species contains all trans amide bonds.55
