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Keywords:

  • helical structures;
  • hydrogen bonds;
  • peptide conformation;
  • ribbon structures
Thumbnail image of graphical abstract

Nine is the number: Novel C9-hydrogen-bonded structures (in which the hydrogen bonds enclose a ring of nine atoms) are observed in protected di- and tetrapeptides formed by the γ-amino acid residue gabapentin. The structures reveal new families of C9 helices and ribbons (see structure) in γ-polypeptides.