Used primarily as a reference standard or impurity control in the quality assurance of ibrutinib, a targeted cancer therapy drug. It helps in analytical testing to ensure the purity, stability, and consistency of ibrutinib during pharmaceutical manufacturing. This compound is essential in HPLC and LC-MS methods for detecting and quantifying impurities in drug substances and products. Its presence in controlled amounts allows researchers and quality control laboratories to validate analytical procedures and monitor degradation products, ensuring the safety and efficacy of the final medication.