Table 4.

50% inhibition of scavenging activity for compounds 4a–f.

Compounds	aIC50  × 10−3
Ascorbic acid	38
4a	53
4b	54
4c	41
4d	68
4e	71
4f	80
9-Amino-acridine-propranolol	13.6

^aIC₅₀ values were determined by linear regression analysis using different concentrations in triplicate.