Used primarily as a reference standard in pharmaceutical quality control, this impurity helps in the identification and quantification of degradation products or by-products in mometasone furoate formulations. It supports validation of analytical methods such as HPLC and LC-MS to ensure drug purity, stability, and consistency during manufacturing. Its presence is monitored to assess the safety and efficacy of final steroid-based products, particularly in nasal sprays and topical creams.