(a)
(b)
Figure 4: The activity detection of compounds 1, 2, 3 and 4 on H2O2-induced apoptosis on H9c2 cells. (a) Toxicity of four compounds on H9c2 cells. (b) The active ingredients on H9c2 cells assessed by MTT. (means ± SD, n = 3). P < 0.001, P < 0.01, P < 0.05 compared with control; ###P < 0.001, ##P < 0.01, #P < 0.05 compared with H2O2.