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It also known as 3,3′,4′,5,7-pentahydroxyflavonoids, has a molecular formula of C15H10O7 and belongs to the flavonols in flavonoids. Quercetin is a large amount of flavonoids, mostly in the form of glycosides, widely distributed in flowers, leaves, and fruits of plants. It has anti-inflammatory, antioxidant, antibacterial, anticancer and antiviral effects