The flavanonols are a class of flavonoid

Flavonoid

Flavonoids , are a class of plant secondary metabolites....

s that use the 3-hydroxy-2,3-dihydro-2-phenylchromen-4-one (IUPAC name) backbone.

Some examples include:

• Taxifolin
  Taxifolin
  Taxifolin is a flavanonol, a type of flavonoid. It can be found in the açaí palm, in the Siberian larch in Russia and in the silymarin extract from the milk thistle seeds. It's also found in small quantities in red onion.-Pharmacology:...
  
   (or Dihydroquercetin)
• Aromadedrin
  Aromadedrin
  Aromadedrin is a flavanonol, a type of flavonoid. It can be found in the wood of Pinus sibirica.-Metabolism:The enzyme dihydrokaempferol 4-reductase uses cis-3,4-leucopelargonidin and NADP+ to produce -aromadedrin, NADPH, and...
  
   (or Dihydrokaempferol)

Metabolism

• Flavanone 3-dioxygenase
  Flavanone 3-dioxygenase
  In enzymology, a flavanone 3-dioxygenase is an enzyme that catalyzes the chemical reactionThe 3 substrates of this enzyme are flavanone, 2-oxoglutarate, and O2, whereas its 3 products are dihydroflavonol, succinate, and CO2....
  
  
• Flavonol synthase
  Flavonol synthase
  In enzymology, a flavonol synthase is an enzyme that catalyzes the chemical reactionThe 3 substrates of this enzyme are dihydroflavonol, 2-oxoglutarate, and O2, whereas its 4 products are flavonol, succinate, CO2, and H2O....
  
  
• Dihydroflavonol 4-reductase

Glycosides

Glycosides (chrysandroside A and chrysandroside B) can be found in the roots of Gordonia chrysandra. Xeractinol

Xeractinol

Xeractinol is a flavanonol, a type of flavonoid. It is a glucoside that can be found in the leaves of Paepalanthus argenteus ....

, a dihydroflavonol C-glucoside can be isolated from the leaves of Paepalanthus argenteus var. argenteus.

Dihydro-flavonol glycosides (astilbin

Astilbin

Astilbin is a flavanonol, a type of flavonoid. Astilbin is the -isomer; neoisoastilbin is the -isomer and isoastilbin is the -isomer....

, neoastilbin, (2R, 3R)-taxifolin

Taxifolin

Taxifolin is a flavanonol, a type of flavonoid. It can be found in the açaí palm, in the Siberian larch in Russia and in the silymarin extract from the milk thistle seeds. It's also found in small quantities in red onion.-Pharmacology:...

-3'-O-beta-D-pyranglucoside) have been identified in the rhizome of Smilax glabra.