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Structure of quercetin. Quercetin contains the basic structure of flavonoids: diphenylpropane (C6–C3–C6) with hydroxyl groups attached to the rings. The official nomenclature according to IUPAC is 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one. Other names include 5,7,3′,4′-flavon-3-ol, sophoretin, meletin, quercetine, xanthaurine, quercetol, quercitin, quertine, and flavin meletin. Chemical formula: C15H10O7.
