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Classification and example of flavonoids and their chemical structures. Flavonoids are classified into six groups, including flavonol, flavanone, isoflavone, flavone, flavan-3-ols, and anthocyanin. Chemical structures of each of the six classes of flavonoids are shown as examples, including isorhamnetin for flavonol, naringin for flavanone, daizein for isoflavone, apigenin for flavone, catechin for flavov-3-ols, and cyanidin for anthocyanins.
