Gallocatechin-catechin dimer

Dimers Catechin-(4a 8)-gallocatechin (tentative) Cistus incanus 40 OJ D... 

Condensed tannins are flavan dimers or polymers with C-C bonds between different flavan-3-ol units. An example of this is the green tea extract, a vegetable extract frequently used in cosmetics, whose main active compounds are condensed tannins that reach between 17 and 30% of the dry weight of leaves (Katiyar et at, 1999, 2000). The most important ones are flavan-3-ols (catechins) and their condensed forms like (+)-catechin, (—)-epicatechin, (+)-gallocatechin, ( )-epigallocatechin, ( )-epicatechingallate and epi-gallocatechingallate. This extract is used because of the specific actions exerted by active compounds, which include anti-free radical, anti-metalloproteinase, anti-inflammatory and photo-protective actions (Kim et al, 1999 Ahmad and Mukhtar, 2001). 

---