Flavonols: Flavonols are a subgroup of flavonoids derived from 3-hydroxyflavone (3-hydroxy-2-phenylchromen-4-one in IUPAC nomenclature) or flavonol, i.e. flavonoids possessing a phenolic hydroxyl in C3 and a C=O carbonyl function at C4 on the central heterocycle of the basic flavonoid skeleton. These are plant pigments of a more or less light yellow color. They differ in the number and position of phenolic hydroxyl –OH, sometimes methylated (metho...
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