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Flavonoids are assumed to have beneficial effects due to their antioxidant properties. The catechol moiety present in numerous flavonoids is oxidized during the antioxidative reaction yielding a quinone. Quinones are toxic due to their ability to react, e.g. with thiol groups. The 3,5,7-trihydroxy-4H-chromen-4-one group is another antioxidant pharmacophor in certain flavonoids. During the antioxidative...