Table 3.

DPPH radical scavenging activity of 1,3,4-oxadiazoles derivatives.

Compounds	IC50 (μM)
4 a	122.6 ± 5.1
4b	107.2 ± 3.4
4c	37.98 ± 4.1
4e	58.97 ± 6.3
4f	46.63 ± 4.6
4g	50.78 ± 2.1
4h	57.82 ± 1.8
4i	40.20 ± 3.3
4j	51.61 ± 2.1
4k	34.40 ± 3.2
4l	88.18 ± 4.1
4m	42.74 ± 3.7
4n	60.28 ± 4.3
4o	43.59 ± 3.1
4r	10.83 ± 0.2
Propyl gallate	40.80 ± 1.2
3-tert-Butyl-4-hydroxyanisole	28.20 ± 1.1