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Quercetin 3,4''-Diglucoside is a flavonoid that has shown to be the antioxidative phenolic constituent of skins of onions.

ChEBI:Quercetin 3,4'-di-O-beta-D-glucoside is a quercetin O-glucoside that is quercetin with two beta-D-glucosyl residues attached at positions 3 and 4'. It has a role as a plant metabolite, a radical scavenger and a cardioprotective agent. It is a beta-D-glucoside, a monosaccharide derivative, a polyphenol, a quercetin O-glucoside and a trihydroxyflavone.