Used in research to selectively inhibit Bruton's tyrosine kinase (Btk), this compound helps study signaling pathways in B cells. It is applied in immunology and oncology studies, particularly to investigate B-cell activation and proliferation. It serves as a tool compound for understanding diseases like chronic lymphocytic leukemia and rheumatoid arthritis. Its selectivity makes it useful for probing Btk-dependent cellular responses without affecting unrelated kinases significantly.