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 Non-monomeric flavonoids. Flavonoids can also bond to
one another, particularly through their very reactive C-6 or C-
8. The result is a dimer known as a biflavonoid. The majority
of natural biflavonoids are dimers of flavones and flavanones.

 Flavonoid oligomers are built from leucoanthocyanes or
anthocyanes units, condensed tannins are polymers of

flavonoids.
 Most of these euflavonoids, or flavonoids in the strict
sense (flavanones, flavones, flavonols, and anthocyanins) bear

ring B in position 2 of the heterocyclic ring.

Morelloflavone

(Biflavonoid)