Structures and apoptotic activity for the analyzed compounds. Jurkat cells (10⁶/mL) were incubated for 20 hours at 37°C with increasing concentrations (30-100 μM) of the different compounds shown in the top panel. Necrosis and apoptosis were assessed as reported as described in “Materials and Methods” and in Figure 1B. Necrosis was not shown in the bar graph since it remained below 5% regardless of the compounds tested. The results obtained with FHC (compound a) are as same as those in Figure 5 and are reported in the present graph to provide the proper term of comparison. Values are means ± SD of at least 4 experiments.