Fig. 3: β-Turn structures.
From: Heterochiral coupling to bilateral β-turn structured azapeptides bearing two remote chiral centers
a X-ray crystal structure of L,D-AcFTU2 with atom labeling. b X-ray crystal structure of L,L-AcFTU2. Intramolecular hydrogen bonds are shown by dashed pink lines and β-turn structures are labeled as β1, β1’ for L,D-AcFTU2, and β2 and β3 for L,L-AcFTU2. c Absorption and CD spectra of L,L-AcFTU2 (blue line), D,D-AcFTU2 (red line), and L,D-AcFTU2 (black line) in 99/1 (v/v) MeCN/DMSO. Concentration: 20 μM. d Temperature-dependent chemical shifts and the fitted temperature coefficients (Δδ/ΔT) of –NHd protons of L,D-AcFTU2 and L,L-AcFTU2 in 95:5 (v/v) CD3CN/DMSO-d6 mixtures.
