4-Amino-TEMPO can be used as a spin label for detecting radicals and the damage caused by them. 4-Amino-TEMPO possesses superoxide dismutase-mimetic activity, enabling it to easily penetrate cells and protect them from oxidative damage induced by H₂O₂. Additionally, 4-Amino-TEMPO exhibits significant radiation protective properties, effectively safeguarding DNA from oxidative stress-induced damage caused by UV exposure due to its ability to maintain a positive charge. Furthermore, 4-Amino-TEMPO is a highly selective oxidation catalyst widely used in the research and development of various specialty chemicals, including fragrances, pesticides, and others ^[1].