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Dependence of the protonation constants (log KiH) of DOTA on the EtOH content in H2O/EtOH mixtures at 25 °C in 0.15 M NaCl ([DOTA] = 2.00 mM; log KlH, black ◆; log K2H, blue ■; log K3H, red ▲; log K4H, green ●; log K5H, pink ◀; log K6H, brown ▼)