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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.
Panthenol (pantothenol) is the alcohol analog of pantothenic acid (vitamin B 5), and is thus a provitamin of B 5.In organisms it is quickly oxidized to pantothenate.n cosmetics and personal-care products, panthenol is a humectant, emollient, and moisturizer. It binds to the hair shaft readily; so, it is a common component of commercial shampoos and hair conditioners (in concentrations of 0.1-1.0%).