This chemical is widely used as a stable free radical in various scientific studies and applications. It serves as a key reagent in antioxidant research, where it is employed to assess the radical-scavenging activity of compounds. By measuring the reduction of its radical form, researchers can evaluate the effectiveness of antioxidants in neutralizing free radicals. It is also used as an indicator to measure antioxidant capacity in biological and food samples due to its stability and reactivity with other free radicals. Commonly used to test the efficacy of antioxidants in dietary supplements, cosmetics, and pharmaceuticals. Additionally, it is utilized in polymer chemistry to study the kinetics of radical reactions and the stability of materials under oxidative conditions. Its stability and distinct spectroscopic properties make it a valuable tool in ESR (electron spin resonance) spectroscopy for detecting and quantifying free radicals in different systems. Furthermore, it is applied in scientific research to study the mechanisms of antioxidants and their health impacts.