Used primarily as a reference standard in pharmaceutical quality control and analytical testing, this compound serves as an impurity marker for etoricoxib, a nonsteroidal anti-inflammatory drug (NSAID). It helps in the identification, quantification, and monitoring of impurities during the manufacturing and stability testing of etoricoxib formulations. Its presence allows laboratories to validate analytical methods such as HPLC and mass spectrometry, ensuring drug purity, safety, and regulatory compliance. Due to its structural similarity to the active pharmaceutical ingredient, it is critical in assessing degradation pathways and establishing shelf life.