Flavan

The flavans are benzopyran derivatives that use the 2-phenyl-3,4-dihydro-2H-chromene skeleton.wikipedia
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Flavan-3-ol

flavanolcatechinsflavanols
These compounds include the flavan-3-ols, flavan-4-ols and flavan-3,4-diols (leucoanthocyanidin).
Flavan-3-ols (sometimes referred to as flavanols) are derivatives of flavans that possess a 2-phenyl-3,4-dihydro-2H-chromen-3-ol skeleton.

Casuarina glauca

C. glaucaSwamp oak
Casuarina glauca is an actinorhizal plant producing root nitrogen-fixing nodules infested by Frankia.
There is a regular pattern of cell layers containing flavans.

Benzopyran

chromeneIsochromenebenzapyra-2-one
The flavans are benzopyran derivatives that use the 2-phenyl-3,4-dihydro-2H-chromene skeleton.

Flavan-4-ol

3-deoxyflavonoids(2S)-flavan-4-olflavan-4-ols
These compounds include the flavan-3-ols, flavan-4-ols and flavan-3,4-diols (leucoanthocyanidin).

Leucoanthocyanidin

leucoanthocyaninflavan-3,4-diol2,3-trans-3,4-cis-leucocyanidin
These compounds include the flavan-3-ols, flavan-4-ols and flavan-3,4-diols (leucoanthocyanidin).

Chocolate liquor

cocoacocoa liquorcocoa mass
A C-glycosidic flavan can be isolated from cocoa liquor.

Actinorhizal plant

actinorhizalactinorhizaenitrogen-fixing
Casuarina glauca is an actinorhizal plant producing root nitrogen-fixing nodules infested by Frankia.

Frankia

FrankiaceaeFrankia sp.Frankia'' sp. Eu11b
Casuarina glauca is an actinorhizal plant producing root nitrogen-fixing nodules infested by Frankia.

Condensed tannin

condensed tanninsOligomeric proanthocyanidinPycnogenol
Condensed tannins (proanthocyanidins, polyflavonoid tannins, catechol-type tannins, pyrocatecollic type tannins, non-hydrolyzable tannins or flavolans) are polymers formed by the condensation of flavans.

Diffutin

C23H28O10
Diffutin is a flavan, a type of flavonoid.

Diffutidin

Diffutidin is a flavan, a type of flavonoid.

5,7,4'-Trimethoxyflavan

5,7,4'-Trimethoxyflavan is a flavan, a type of flavonoid.

Pancratium maritimum

sea daffodilSand LilyLily Sand
4'-Hydroxy-5,7-dimethoxy-8-methylflavan is a flavan found in ''P.

Fustin

This makes fustin a flavan, with two stereocenters and four stereoisomers.

Alexander Dianin

Aleksandr Dianin
In cases where an olefinic moiety can interact with a phenolic hydroxyl group (typically as a result of ortho-substitution), rapid cyclisation reactions producing flavans and chromans occur.