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 linagliptin, a medication for type 2 diabetes. It helps in validating analytical methods such as HPLC and LC-MS to ensure accurate detection and quantification of impurities in linagliptin formulations. Its presence is monitored to maintain drug purity, safety, and compliance with regulatory guidelines. Due to its structural similarity to the active pharmaceutical ingredient, it is essential for stability studies and process optimization during manufacturing.