Fig. 3

Effects of isolated compounds 1–7 (a) and 8–13 (b) on cell viability of RAW 264.7 macrophages. Cells were incubated for 24 h with the indicated concentrations of compounds (1, 5, 25, 50 and 100 μg/mL). data are expressed as mean ± S.D. Of three independent experiments. * p < 0.05 and ** p < 0.01 versus the control group