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Hydroquinone, also benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula C6H4(OH)2. Its chemical structure, shown in the table at right, features two hydroxyl groups bonded to a benzene ring in a para position.
Pycnogenol is a patented formulation of Pine Bark Extract which is standardized to 65-75% Procyanidin compounds by weight. Procyanidins are chain-like structures consisted of catechins similar to some found in green tea (the Green Tea Catechins that do not have 'gallate' in their names).