These results were not completely unexpected, since it was known from the literature that complexes of Pt(IV) carrying benzoate ligands in the axial positions are very active, even at nanomolar concentrations, as it is in this case. [17,30] Thus, the pharmacological activity decreases in the order 3 >> 1 ≈ 2 ≈ 4 > 5 > 6.
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