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Cell viability was evaluated by MTS assay after treatment at different concentrations (50 nM, 100 nM, 1 µM, 5 µM) for 24, 48 and 72 h with compounds 9–15 on RPMI-8226 cell line. Results are expressed as percent of cell viability normalized to DMSO-treated cells. The line-graphs represent average with SD from three independent experiments.
