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Schematic presentation of the hydrolytic reaction of Ac–L–Met–Gly (a) and Ac–L–His–Gly (b) in the presence of complexes 1a–3a in the pH range 2.0 < pH < 2.5 in D2O as a solvent and at 37°C. In the reaction with Ac–L–His–Gly, only 1a was catalytically active complex.
