SU9516 is primarily utilized in biochemical research to study cell cycle regulation and cancer biology. It functions as a potent inhibitor of cyclin-dependent kinases (CDKs), particularly CDK2, which plays a critical role in controlling cell division. By inhibiting CDK2, SU9516 helps researchers investigate the mechanisms of cell proliferation and apoptosis, providing insights into potential therapeutic strategies for cancer. Additionally, it is used in vitro to explore the effects of CDK inhibition on tumor growth and to identify pathways involved in cell cycle arrest. This compound is a valuable tool for understanding the molecular basis of diseases linked to abnormal cell cycle progression.