Table 2.

Inhibitory effects (%) ^a of compounds 10–22 on U937 cell viability (mean ± SD; n = 4).

Comp.	1 µM	50 µM	100 µM
10	28.00 ± 2.75	30.73 ± 2.12	28.81 ± 2.05
11	32.34 ± 1.93	28.58 ± 1.62	29.43 ± 2.76
12	20.38 ± 3.04	27.01 ± 3.68	24.72 ± 1.48
13	26.75 ± 2.12	45.31 ± 1.91	39.10 ± 0.92
14	25.57 ± 2.50	31.10 ± 3.53	29.86 ± 1.70
15	35.03 ± 2.05	27.03 ± 0.61	22.37 ± 1.13
16	11.64 ± 0.28	58.86 ± 2.62	90.82 ± 0.43
17	33.87 ± 0.92	61.33 ± 1.98	83.91 ± 0.92
18	36.63 ± 1.98	67.68 ± 1.77	90.78 ± 0.21
19	23.14 ± 3.19	25.46 ± 3.13	23.12 ± 3.43
20	24.33 ± 0.47	30.98 ± 1.04	34.14 ± 0.49
21	5.72 ± 1.27	21.17 ± 1.48	29.29 ± 2.02
22	27.63 ± 0.92	31.85 ± 0.99	33.58 ± 2.71

^a inhibition (%) after 48 h of continuous treatment (n = 4), normalized against U937 cells treated with 1% DMSO (n = 4).