Table 1. Cytotoxicity Assay (MTT) on Nontransfected Human 1321N1 Astrocytoma Cell Line.

compound	% cytotoxicity ± SEM
6a	14.02 ± 0.21
6b	11.37 ± 0.57
6c	15.1 ± 0.44
6d	6.96 ± 0.80
6e	16.76 ± 1.10
6f	8.31 ± 0.33
6g	5.29 ± 0.72
6h	18.53 ± 1.22
7a	11.57 ± 0.89
7b	10.69 ± 0.54
7c	5.98 ± 0.09
7d	1.57 ± 0.11
7e	8.33 ± 0.80
7f	11.57 ± 0.26
7g	23.82 ± 2.15
Cisplatin	84.41 ± 0.54