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 purity and consistency of the active pharmaceutical ingredient. Its presence is monitored to assess degradation pathways and stability under various storage or manufacturing conditions. Due to its structural similarity to ibrutinib, it also supports studies on metabolic byproducts and potential side effects in drug development.