A rare twist: A new class of mixed γ-peptides, derived from dipeptide repeats with alternating C-linked carbo-γ4-amino acids and γ-aminobutyric acid have shown the presence of left-handed 9-helices in solution with CDCl3 (see superimposition of 15 minimum-energy structures of a hexapeptide).
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Sharma et al. (2006) studied this question.
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