Table 1.

The IC50 values of tanshinones to U−2 OS cells, Hela cells, and NRK−49F cells.

IC50 (µM)	DS−1	DS−2	DS−3	DS−4	DS−5
U−2 OS cells (24 h)	3.83 ± 0.49	47.84 ± 4.96	17.75 ± 1.03	22.06 ± 1.31	25.40 ± 1.43
(48 h)	1.99 ± 0.37	25.60 ± 0.81	4.54 ± 1.00	5.89 ± 0.40	5.91 ± 1.08
HeLa cells (24 h)	15.48 ± 0.98	52.07 ± 3.20	20.92 ± 2.81	25.03 ± 2.03	32.09 ± 1.94
NRK−49F cells (24 h)	25.00 ± 1.98	35.39 ± 3.25	107.60 ± 28.85	31.84 ± 1.59	/ a

^a no significant cytotoxicity.