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Cytotoxic effect of compounds 6a-6c on MCF7 cells following exposure to different concentrations (1, 10, and 100 μM). Data are presented as mean ± SD, (SD for negative control is 0.06), n = 3. * Shows significant differences (*P < 0.05, **P < 0.01, and ***P < 0.001) in comparison with negative control group; doxorubicin used as positive control.
