Table 3. DPPH Radical Scavenging Activity of New Compounds in vitro.

Compounds	Concentrations (μg/mL)	Scavenging ratio (%)	IC50 (μg/mL)
1a	100	−2.292 ± 0.263
1b	100	−2.893 ± 0.278
2a	100	−2.477 ± 0.351
2b	100	−4.892 ± 0.088
3a	100	−1.487 ± 0.351
3b	100	−1.363 ± 0
4	100	−1.301 ± 0.263
5	100	−1.796 ± 0.088
6	100	84.784 ± 0.756	16.437 ± 0.22
	50	71.794 ± 0.611
	25	59.629 ± 0.328
	12.5	43.712 ± 0.435
	6.25	29.609 ± 0.993
7	100	−1.796 ± 0.088
8	100	−2.145 ± 0.078
Trolox	50	95.629 ± 0.372	3.895 ± 0.38
	25	94.805 ± 0.611
	12.5	94.433 ± 0.682
	6.25	69.238 ± 3.335
	3.125	41.114 ± 4.279

The data are expressed as the means ± SEM. Three independent experiments were performed. Trolox (vitamin E) was used as the positive control.