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NMR characterization of the three analogues, 1 mM in H2O/ D2O (90:10 v/v), pH 3.5. a) The 1D 1H NMR spectra in the NH region of 4DH3 (top in black), 4DH4 (middle in red) and 4DH5 (bottom in blue). b) The 1D 1H NMR spectra in the αCH region of 4DH3 (top in black), 4DH4 (middle in red) and 4DH5 (bottom in blue).
