Purvalanol B is primarily utilized in biochemical research as a potent and selective inhibitor of cyclin-dependent kinases (CDKs). These enzymes play a critical role in cell cycle regulation, and inhibiting them can help scientists study cell division processes and their dysregulation in diseases like cancer. It is often used in laboratory settings to investigate the effects of CDK inhibition on tumor growth and to explore potential therapeutic strategies. Additionally, Purvalanol B serves as a valuable tool in understanding signaling pathways and molecular mechanisms underlying cellular proliferation and apoptosis. Its specificity makes it a preferred choice for targeted studies in cell biology and oncology research.