SU6656 is primarily used in research settings as a potent and selective inhibitor of Src family kinases (SFKs). It is widely applied in studies aimed at understanding the role of SFKs in various cellular processes, including cell proliferation, differentiation, and migration. Researchers utilize SU6656 to investigate signaling pathways involved in cancer, as SFKs are often implicated in tumor growth and metastasis. Additionally, it is employed in studies related to bone metabolism, immune cell function, and neuronal signaling, providing insights into the molecular mechanisms underlying these processes. Its ability to selectively inhibit SFKs makes it a valuable tool for dissecting kinase-dependent pathways in both normal and pathological conditions.