Used primarily as a reference standard in pharmaceutical quality control, this impurity plays a critical role in the analysis of anastrozole-based medications. It helps in identifying and quantifying degradation products during stability testing of the drug product. Its presence is monitored to ensure the purity, safety, and efficacy of anastrozole formulations, especially in tablets used for the treatment of breast cancer. The compound is also utilized in method development for HPLC and LC-MS techniques to improve detection sensitivity and accuracy in impurity profiling.