Used primarily as a reference standard in pharmaceutical quality control, this compound serves as a critical impurity marker in the synthesis and analysis of ibrutinib, a targeted cancer therapy. It helps in validating analytical methods such as HPLC and LC-MS to ensure the purity and consistency of ibrutinib in drug formulations. Its presence is monitored to assess degradation pathways and stability under various storage conditions, supporting regulatory compliance in drug manufacturing. Due to its structural similarity to the active drug, it also aids in studying metabolic byproducts and potential side effects during preclinical research.