Figure 6.

Comparison of 2D [¹H, ¹H] TOCSY spectra of H−FFgc−NH₂ recorded in H₂O/D₂O 90/10 v/v at different concentrations (A: 1.3 mm, B: 2.6 mm, C: 14.2 mm, D: 46.9 mm). The region containing correlations from aromatic protons and the terminal CONH₂ group are reported. Cross‐peaks arising from the H5‐H6 protons of cytosine are enclosed in rectangles, the cycles highlight cross‐peaks from the C‐terminal CONH₂ group and the brackets point to cross‐peaks from aromatic protons in Phe residues.