Figure 2.

The viability of A549 non-small cell lung cancer (NSCLC) cells after 24 h treatment with compounds 9–16 and reference drug doxorubicin (DOX) with a fixed concentration of 100 µM. The A549 cells were treated with the corresponding compounds or comparator drug and the post-treatment cell viability was evaluated using MTT assay. The percent of viability was calculated from an untreated control. Data shown are mean ± SD values from three separate experiments for each group. The significance of the data was determined using a one-way ANOVA test. * p < 0.05, *** p < 0.0002, **** p < 0.0001.