Nitroxides are stable free radicals that contain a nitroxyl group with an unpaired electron.
Marcin Lewandowski, Krzysztof Gwozdzinski 2017, 'Nitroxides as Antioxidants and Anticancer Drugs', International Journal of Molecular Scienceshttps://www.mdpi.com/1422-0067/18/11/2490. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)