Used primarily as a reference standard in pharmaceutical quality control and analytical testing, this compound serves as a key impurity marker in the manufacturing and stability studies of linagliptin, a medication for type 2 diabetes. It helps in identifying and quantifying impurities during drug development, ensuring purity, safety, and regulatory compliance of the final drug product. Its presence is monitored using techniques like HPLC and LC-MS to validate the robustness of synthetic processes and storage conditions.