Table 5. DPPH Radical-scavenging and Superoxide anion Radical-scavenging Activities of The Isolated Compounds 1–25.^a .

	EC50 (μM)
Compound b	DPPH	Superoxide anion
1	11.89±0.72	27.94±0.59
2	7.89±0.50	38.24±0.92
3	11.75±1.04	45.09±1.66
4	9.76±0.61	30.62±0.99
5	9.80±0.53	24.62±1.67
6	9.18±0.97	50.69±6.70
7	301.24±13.84	121.91±5.49
8	152.47±5.90	196.45±7.98
9	79.38±4.74	90.70±8.28
10	221.61±13.79	194.24±8.12
11	6.46±0.39	58.33±2.39
12	>500	149.56±9.10
13	>500	191.19±15.0
14	>500	174.63±9.72
15	7.87±0.73	15.17±0.70
16	10.76±0.94	37.49±2.62
18	11.88±0.69	100.72±8.27
20	10.69±0.34	214.35±16.91
21	9.04±0.21	605.75±25.81
24	>500	417.21±23.90
25	6.74±0.28	45.79±2.97
Gallic acid	5.18±0.34	10.12±0.39
Ascorbic acid	33.46±1.20	>500

^aValues are the mean ± SD; n = 3.

^bCompounds 17, 19, 22 and 23 did not show DPPH radical-scavenging or superoxide anion radical-scavenging activity (EC50 >500 μM).