Table 1.

Antioxidant activities of compounds 1–7 in cell-based and cell-free assays.

Compounds	ROS Level, % of Control		DPPH Scavenger Activity IC50, µM
	Paraquat (PQ)	6-OHDA
neurotoxin	148.4. ± 6.9	139.2 ± 1.8	-
1a	94.1 ± 4.1	132.9 ± 2.7	122.4 ± 7.1
1b	83.2 ± 2.3	121.2 ± 1.6	118.1 ± 4.7
2	92.8 ± 2.4	-	23.6 [25]
3	90.3 ± 2.2	-	29.9 [26]
4	101.8 ± 7.6	-	34.0 [26]
5	97.4 ± 2.8	-	31.1 [26]
6	94.1 ± 2.9	-	46.0 [25]
7	101.8 ± 7.6	95.4 ± 3.4	62.6 ± 1.1