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Imino and aromatic regions of 1H NMR spectra of TBA and its analogues acquired at 25°C. Samples of TBA, TBA4 and TBA13 dissolved in 50 mM KCl solution, while samples TBA9M and TBA9D were dissolved in 20 and 100 mM KCl solution, respectively. Signals of imino protons involved in hydrogen bonds are assigned and marked above individual signal.
