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Effects of the isolated compounds 1–9 (A–I) and cisplatin (J) on metabolic activity in MCF-7 human breast cancer cells. Control cells were treated with 0.5% DMSO. The experiment was performed in triplicate, and the error bars represent the standard deviation of samples (n = 3). * p < 0.05, ** p < 0.01 compared with the control.
