Figure 5. ¹H NMR spectra (11.5–10.2 ppm and 9.0–7.0 ppm), acquired at T = 25°C in H₂O, containing 25 mM KH₂PO₄, KCl 150 mM and EDTA 1 mM (pH 6.7), showing resonance of imino protons G4, G5 and G6 as well as the aromatic protons at different R = [1]/Htel_.