Table 2.

Inhibition of the proliferation of U266 cells by the 10 chemical components

Components	inhibition ratio (%)					IC50(μmol/L)
	10−4 M	5 × 10−5 M	2.5 × 10−5 M	10− 5 M	5 × 10−6 M
3-O-acetyl-boswellic acid	84.18 ± 2.38	59.22 ± 6.41	44.06 ± 4.96	11.65 ± 0.09	6.47 ± 2.14	35.02
3α-acetyl-20 (29)-lupene-24-oic acid	35.30 ± 0.40	25.11 ± 2.76	17.37 ± 0.88	13.41 ± 1.88	7.54 ± 1.43	293.20
β-boswellic acid	43.68 ± 6.75	22.99 ± 3.79	20.18 ± 0.57	16.48 ± 4.43	9.22 ± 0.44	213.36
acetyl 11α-methoxy-β-boswellic acid	47.66 ± 3.84	35.18 ± 2.54	31.52 ± 6.38	30.32 ± 7.02	7.45 ± 0.95	103.53
3α-acetoxy-tirucall-7,24-dien-21-oic acid	18.90 ± 6.44	8.48 ± 1.66	5.62 ± 0.48	3.91 ± 0.79	1.76 ± 1.44	665.81
3-acetyl-11-keto-β-boswellic acid	68.58 ± 0.35	39.13 ± 10.2	13.04 ± 1.42	7.42 ± 3.56	10.14 ± 0.52	67.79
11-keto-β-boswellic acid	69.62 ± 1.56	9.05 ± 1.45	7.89 ± 10.91	2.64 ± 0.23	4.17 ± 10.46	86.56
3-acetyl-β-boswellic acid	34.27 ± 6.95	26.34 ± 2.65	16.98 ± 6.97	14.24 ± 1.84	5.39 ± 0.81	267.88
abietic acid	24.37 ± 5.41	18.25 ± 4.03	13.70 ± 2.60	7.52 ± 1.27	5.11 ± 2.39	643.48
2-methoxy-8,11-epoxygermacra-1 (10)-7,11-trien-6-one	27.17 ± 3.72	23.42 ± 3.68	22.74 ± 3.71	15.02 ± 0.91	11.09 ± 4.71	1411.47