Quercetin

Quercetin is a pentahydroxyflavone having the five hydroxy groups placed at the 3-, 3′-, 4′-, 5- and 7-positions. It is one of the most abundant flavonoids in edible vegetables, fruit and wine. Among its listed roles, it functions as a antibacterial agent, an antioxidant, a protein kinase inhibitor, an antineoplastic agent, an EC 1.10.99.2 [ribosyldihydronicotinamide dehydrogenase (quinone)] inhibitor, a plant metabolite, a phytoestrogen, a radical scavenger, a chelator, an Aurora kinase inhibitor and a geroprotector. It is a pentahydroxyflavone and a 7-hydroxyflavonol. It is the conjugate acid of quercetin-7-olate. The directory classifies it as a commercial API with a natural source/manufacturing origin. Other names for this substance include Meletin, Sophoretin and Quercetine. Its PubChem CID is 5280343.