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Quercetin 3,3'-dimethyl ether possesses antioxidant acticity[1].

ChEBI: 3,3'-dimethylquercetin is a dimethoxyflavone that is quercetin in which the hydroxy groups at position 3 and 3' have been replaced by methoxy groups. It has been isolated from several plant species and exhibits anti-bacterial and anti-cancer properties. It has a role as a plant metabolite, an antibacterial agent, an antineoplastic agent and an apoptosis inducer. It is a trihydroxyflavone, a dimethoxyflavone and a member of 3'-methoxyflavones. It is functionally related to a quercetin.

[1] Zhang Jun, et al. Antioxidant action of apigenin, quercetin-3,3'-dimethyl etherhe and quercetagetin-3,6-dimethyl ether-7-o-glucoside in vitro. Laboratory Center for Medical Science, Lanzhou Medical College.