9-Propenyladenine, as a tenofovir impurity, is primarily relevant in the pharmaceutical industry, particularly in the production and quality control of antiviral medications. Its main application lies in ensuring the purity and safety of tenofovir-based drugs, which are widely used in the treatment of HIV and hepatitis B. During the manufacturing process, it is crucial to monitor and control the levels of this impurity to comply with regulatory standards and maintain the efficacy of the final drug product. Analytical methods, such as HPLC or LC-MS, are often employed to detect and quantify 9-Propenyladenine in drug formulations. Additionally, studying this impurity helps in understanding the degradation pathways of tenofovir, aiding in the development of more stable and effective drug formulations.