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Effects of compounds 3d, 7a, 8a, 8b and 12c on cell viability of four cancer cell lines. Percentage of viable cells (SK-N-SH, DLD1, MDA-MB-231 and A549) after 72 h exposure to the compounds at a concentration of 25 μM. Each value was calculated from two independent experiments. The competitive inhibitory activity was expressed as an inhibition rate.
