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No.7 and No.18 carbazole derivatives had low toxicity to vero-81 cells. (a–c) Cells were treated with increasing concentration (0, 10, 20, 40, 60, 80 µM) of No.5 (a), No.7 (b), or No.18 (c) carbazole derivatives for 24 h. The relative cell viability was evaluated by the CCK8 Kit. The dotted line indicates the 80% cytostatic concentration.
