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Cytotoxicity of indole derivatives in A549 cells. (A) Molecular structure of 3-indoleacetonitrile, indole-3-carboxaldehyde, 3-carboxyindole, and gramine. (B) A549 cells were treated with 3-indoleacetonitrile, indole-3-carboxaldehyde, 3-carboxyindole, or gramine using the indicated concentrations for 24 h. Then, the cell viability was measured by CCK-8.
