Thonningianin A, an ellagitannin, is isolated from the methanolic extract of the African medicinal herb, Thonningia sanguinea. The antioxidant properties of Th A involve radical scavenging, anti-superoxide formation and metal chelation. Anti-cancer activities[1][2].
[1]. Gyamfi MA, et al. Antioxidant properties of Thonningianin A, isolated from the African medicinal herb, Thonningia sanguinea. Biochem Pharmacol. 2002 May 1;63(9):1725-37. [2]. Zhang TT, et al. Effects of thonningianin A in natural foods on apoptosis and cell cycle arrest of HepG-2 human hepatocellular carcinoma cells. Food Funct. 2015 Aug;6(8):2588-97.