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The interaction of two bis-chelated VIVO²⁺ complexes, formed by pipemidic (Hpip) and 8-hydroxyquinoline-5-sulfonic acids (Hhqs), with two small proteins, ubiquitin (Ub) and lysozyme (Lyz) was studied by EPR, ESI-MS, docking and DFT methods. The two complexes differ by electric charge (at neutral pH it is +2 and -2 for the species formed by Hpip and...