BAY-61-3606 is primarily used in research settings as a potent and selective inhibitor of the enzyme Syk (spleen tyrosine kinase). It is widely applied in studies focused on understanding the role of Syk in various cellular processes, particularly in immune responses and inflammation. Researchers utilize this compound to investigate its effects on B-cell receptor signaling, mast cell activation, and platelet function. Additionally, BAY-61-3606 is employed in preclinical studies to explore its potential therapeutic applications in autoimmune diseases, allergic disorders, and certain cancers where Syk signaling plays a critical role. Its ability to modulate Syk activity makes it a valuable tool for elucidating pathways and developing targeted treatments.