Flavanonol

The flavanonols (with two "o"s a.k.a. 3-hydroxyflavanone or 2,3-dihydroflavonol) are a class of flavonoids that use the 3-hydroxy-2,3-dihydro-2-phenylchromen-4-one (IUPAC name) backbone.

Some examples include:
 * Taxifolin (or Dihydroquercetin)
 * Aromadedrin (or Dihydrokaempferol)
 * Engeletin (or Dihydrokaempferol-3-rhamnoside)

Metabolism

 * Flavanone 3-dioxygenase
 * Flavonol synthase
 * Dihydroflavonol 4-reductase

Glycosides
Glycosides (chrysandroside A and chrysandroside B) can be found in the roots of Gordonia chrysandra. Xeractinol, a dihydroflavonol C-glucoside, can be isolated from the leaves of ''Paepalanthus argenteus var. argenteus''.

Dihydro-flavonol glycosides (astilbin, neoastilbin, isoastilbin, neoisoastilbin, (2R, 3R)-taxifolin-3'-O-β-D-pyranoglucoside) have been identified in the rhizome of Smilax glabra.