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Circular dichroism (CD) spectra of the peptoid-based SP-C mimics (Mimics C, CIle1, CIle2, and di-pCIle2) showing qualitatively similar characteristics of peptoid helices. As the aliphatic content is increased, the CD spectra display features that are progressively similar to a polyproline type I peptide helix. Spectra were acquired in methanol at a concentration of ~ 60 μM at room temperature.
