ubiquinone

Coenzyme Q10 (also known as ubiquinone, ubidecarenone, coenzyme Q, and abbreviated at times to CoQ10, CoQ, Q10, or Q) is a benzoquinone, where Q refers to the quinone chemical group, and 10 refers to the isoprenyl chemical subunits. This vitamin-like substance is, by nature, present in all human cells and responsible for the production of the body’s own energy. In each human cell, food energy is converted into energy in the mitochondria with the aid of CoQ10. Ninety-five percent of all the human body’s energy requirements (ATP) is converted with the aid of CoQ10. Therefore, those organs with the highest energy requirements – such as the heart, the lungs, and the liver – have the highest CoQ10 concentrations.
See more at Wikipedia.org...

Ubiquinone /ubi·qui·none/ a quinone derivative with an unsaturated branched hydrocarbon side chain occurring in the lipid core of inner [more]Ubiquinone - Community and Resources

Noun
1. any of several quinones that function as electron-carrying coenzymes
(synonym) coenzyme Q
(hypernym) quinone, benzoquinone

n. ubiquinone

A substance found in most tissues in the body, and in many foods. It can also be made in the laboratory. It is used by the body to produce energy for cells, and as an antioxidant. It is being studied in the treatment of cancer and in the relief of side effects caused by some cancer treatments. Also called coenzyme Q10, Q10, CoQ10, and vitamin Q10.