Table 3 Antioxidant potential of compounds (3a–k and 3l–p) by DPPH radical scavenging activity

1

3a

33.4 ± 0.29

2

3b

23.9 ± 0.31

3

3c

37.5 ± 0.42

4

3d

48.2 ± 0.42

5

3e

38.5 ± 0.42

6

3f

39.2 ± 0.42

7

3g

82.0 ± 0.78

8

3h

***

9

3i

28.9 ± 0.45

10

3j

81.3 ± 0.72

11

3k

21.9 ± 0.32

12

3l

86.0 ± 0.73

13

3m

1.19 ± 0.02

14

3n

40.9 ± 0.21

15

3o

15.1 ± 0.21

16

3p

30.9 ± 0.29

17

Ascorbic acid

100 ± 0.99