Cytotoxicities of isolated compounds 1–10 from S. asper roots.

No.	Cytotoxicity IC50a (μM) ± SD
	HL60	A549	AZ521	SKBR3	WI38	SIb
1	NDc	0.03 ± 0.01	ND	0.01 ± 0.01	ND	ND
2	0.24 ± 0.03	0.03 ± 0.01	0.18 ± 0.03	0.48 ± 0.08	0.18 ± 0.02	6.00
3	8.56 ± 0.50	11.52 ± 2.60	18.37 ± 1.05	68.60 ± 7.80	7.60 ± 0.40	0.66
4	0.09 ± 0.02	0.02 ± 0.01	0.12 ± 0.03	0.15 ± 0.01	0.03 ± 0.01	1.50
5	0.01 ± 0.02	0.01 ± 0.01	0.02 ± 0.01	0.16 ± 0.03	0.01 ± 0.01	1.00
6	0.09 ± 0.10	0.01 ± 0.10	0.04 ± 0.10	0.23 ± 0.10	0.08 ± 0.01	8.00
7	0.40 ± 0.10	0.06 ± 0.01	0.17 ± 0.03	1.16 ± 0.27	0.91 ± 0.19	15.00
8	1.72 ± 0.16	0.34 ± 0.03	0.86 ± 0.07	3.77 ± 0.64	8.25 ± 1.66	24.26
9	77.10 ± 0.10	>100	>100	>100	ND	ND
10	>100	>100	>100	>100	ND	ND
Cisplatin	4.20 ± 1.10	18.40 ± 1.90	9.50 ± 0.50	18.80 ± 1.07	20.00 ± 2.40	1.09

^aIC₅₀: 50% inhibition concentration, the values based on quintuple points. Each value represents the mean ± SD (n = 3).

^bSI: Selective index.

^cND: Not determined.