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Constants of the stability of glycylglycinate copper(II) complexes in water–ethanol solutions of variable composition are determined via potentiometry at a temperature of 298 K and an ionic strength of the solutions of 0.1 (NaClO4). It is established that the formation of normal and deprotonated mono- and bis-glycylglycinate copper(II) complexes is possible in solutions. When the concentration of...