Used primarily as a reference standard in pharmaceutical quality control and analytical testing. It helps in identifying and quantifying impurities during the synthesis and purification of etoricoxib, a nonsteroidal anti-inflammatory drug (NSAID). This compound ensures the safety, efficacy, and purity of the final drug product by monitoring degradation products and process-related impurities. It is essential in HPLC and LC-MS method development, validation, and stability studies in drug manufacturing and research laboratories.