Used primarily as a reference standard in pharmaceutical quality control, this compound aids in the analysis and detection of impurities during the synthesis and purification of ibrutinib, a targeted cancer therapy. It helps ensure the purity, safety, and consistency of the final drug product by serving as a marker in high-performance liquid chromatography (HPLC) and other analytical methods. Its presence in controlled amounts allows manufacturers to optimize synthesis conditions and validate degradation pathways, supporting regulatory compliance in drug development.