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Cytotoxicity profiles of complexes 1–4 for HT-29 and HeLa cell lines after 48 h of incubation. The cells were treated with varying concentrations (2.5, 5, 10, 20, and 50 μM) of the tested complexes, and the cell viability was measured using the MTT assay. Data are reported as the mean ± SD for n = 4; the symbol *** represents a statistical significance of p < 0.001 as compared to the control.
