Used primarily in biochemical research and pharmaceutical applications, it serves as a stable free radical for studying oxidative stress and lipid peroxidation in biological systems. Its PEG (polyethylene glycol) chain enhances solubility in aqueous environments, making it suitable for use in cell cultures and in vivo studies. It is also employed in electron paramagnetic resonance (EPR) spectroscopy as a spin label to investigate molecular dynamics and interactions. Additionally, it finds use in the development of drug delivery systems, where its properties help in improving the stability and bioavailability of therapeutic agents.