Fig. (2).

Some rationally designed structures (b-c, e-g, i) with antioxidant activities higher than those of the parent compounds (a,d,h). a– α-tocopherol; band c- benzopyran and benzofuran derivatives [26]; d– catechol, e, f and g– substituted catechols [53]; h and i– catechin and its planar analogue [125].