Pentaerythritol is an organic compound, a white, crystalline solid with the formula C5H12O4. It is a polyol with the neopentane backbone and one hydroxyl group in each of the four terminal carbons. Pentaerythritol is a versatile building block for the preparation of many polyfunctionalized compounds, such as the explosive and vasodilator pentaerythritol tetranitrate (PETN) and the polymer cross-linking agent pentaerythritol tetraacrylate. Derivatives of pentaerythritol are components of alkyd resins, varnishes, polyvinyl chloride stabilizers, tall oil esters, and olefin antioxidants. It can be found in transformer oil, plastics, paints, cosmetics, and many other applications.