Cetilistat impurity 1 is primarily used in the pharmaceutical industry as a reference standard in the quality control and analytical testing of Cetilistat, an anti-obesity drug. It helps in identifying and quantifying impurities during the manufacturing process, ensuring the final product meets regulatory and safety standards. This impurity is crucial for developing and validating analytical methods, such as HPLC or LC-MS, to maintain the purity and efficacy of the active pharmaceutical ingredient. Its application is essential for compliance with Good Manufacturing Practices (GMP) and for ensuring the consistency and safety of the drug product.