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a, the crystal structure of the sulfono-γ-AApeptide γ-AA3; b, NMR structure of the sulfono-γ-AApeptide γ-AA4 in MeOH; c, NMR structure of the 1:1 α/sulfono-γ-AA hybrid peptide γ-AA5 in MeOH; d, the crystal structure of γ-AA1 (red), and its superimposition with a type II β turn (yellow, PDB: 1YCC). Reproduced with permission from ref 9 and 11, Copyright 2015 Royal Society of Chemistry and Wiley.
