Table 6.

The ABTS scavenging ability (%) of derivatives 6a–k

Sample	Scavenging ability (%)	Sample	Scavenging ability (%)
6a	30.68 ± 0.09	6g	29.39 ± 0.15
6b	12.95 ± 0.28	6h	26.43 ± 0.15
6c	12.59 ± 0.31	6i	32.03 ± 0.14
6d	90.05 ± 0.07	6j	47.13 ± 0.12
6e	66.00 ± 0.12	6k	57.36 ± 0.11
6f	73.43 ± 0.56
Theophylline	25.97 ± 0.27	Vitamin C a	78.42 ± 0.40

^a0.004 mg/mL; Data are mean ± SD (n = 3, p < 0.05)