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Quercetin 5,3′-dimethyl ether is a kind of flavonoid. Quercetin 5,3′-dimethyl ether can be isolated from Combretum erythrophyllum (Combretaceae). Quercetin 5,3′-dimethyl ether has anti-inflammatory activity and antibacterial activity[1].

[1] N D Martini, et al. Biological activity of five antibacterial flavonoids from Combretum erythrophyllum (Combretaceae). J Ethnopharmacol. 2004, 93, 3. DOI:10.1016/j.jep.2004.02.030