Used primarily as a reference standard in pharmaceutical quality control and analytical testing, this compound serves as a key impurity marker in the synthesis and purification of etoricoxib, a selective COX-2 inhibitor used for anti-inflammatory and analgesic therapy. It helps in validating analytical methods such as HPLC and LC-MS to ensure drug purity, monitor degradation products, and assess the safety and efficacy of the final drug product. Its presence is closely monitored during manufacturing to comply with regulatory guidelines on impurity limits in active pharmaceutical ingredients.