Fig. 3
From: Iridoids from Canthium subcordatum iso-butanol fraction with potent biological activities
Equivalent concentrations of test samples scavenging 50% of DPPH radical (EC50). Bars represent the mean ± SD of three independent experiments carried out in triplicate. Letters a-l indicate significant differences between samples according to one way ANOVA and Waller Duncan test; p < 0.05. 1: canthiumoside 1; 2: canthiumoside 2; 3: canthiumoside 3; 4: canthiumoside 4; 5a: canthiumoside 5; 6: shanzhigenin methyl ester; 7: linearin; 7’: 1-epilinearin; 8: mussaenoside; 9: shanzhiside methyl ester