Table 1.

Percentage of HepG2 Cell Death^a

compd	1 μM	0.1 μM	0.01 μM	0.001 μM
OA	0	0	0	0
18	0	0	0	0
8a	67.41	13.68	10.07	0
8b	100.00	93.50	13.34	1.70
8c	98.16	56.35	10.96	2.60
8d	95.63	67.96	17.32	2.70
8e	74.53	13.01	8.51	0
8f	0	0	0	0
11h	0	0	0	0
14b	0	0	0	0
16b	89.21	55.11	6.67	0

^aData shown are the average percentages of cell death induced by the compound at 24 h post-treatment from three independent experiments. Intragroup variations were less than 10% of the values presented. Treatment of the cells with the compound for a longer period did not increase its cytotoxicity. The other 23 synthesized compounds tested showed no cytotoxicity against HepG2 in our experimental system (data not shown).