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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The aliphatic (a) and aromatic region (b) of the pH-dependent 1H NMR spectra of Ac-HADH-NH2 (cL = 5 mM): a: Asp Hα, His(1),(4) Hα; b: Ala Hα; c: His(1),(4) Hβ; d: Asp Hβ; e: Ac-CH3; f: Ala Hβ; g: His (1),(4) Hδ; h: His (1),(4) Hε.