Table 1.

In vitro DPPH activity and % yield of compounds 1–25.

N°	Yield (%)	IC50 (μM ± SEM a)	N°	Yield (%)	IC50 (μM ± SEM a)
1	84	10.12 ± 0.54	14	87	42.80 ± 2.80
2	82	15.6 ± 0.06	15	82	NA b
3	78	19.2 ± 0.70	16	82	NA b
4	84	28.14 ± 0.86	17	84	NA b
5	85	30.45 ± 0.82	18	83	NA b
6	86	28.10 ± 1.30	19	85	NA b
7	81	33.02 ± 1.20	20	87	NA b
8	83	34.14 ± 1.50	21	88	NA b
9	92	40.01 ± 1.80	22	-	NA b
10	88	NA b	23	90	NA b
11	90	50.01 ± 2.20	24	84	NA b
12	87	38.16 ± 2.10	25	92	NA b
13	90	NA b	n-propyl gallate c	-	30.30 ± 0.2

SEM ^a is the standard error of the mean, NA ^b = Not active, n-propyl gallate ^c was the standard drug for the DPPH assays.