RU-521 is primarily used in research settings to study its effects on specific biological pathways. It is often employed in experiments to understand its role in modulating certain enzymes or receptors, which can provide insights into potential therapeutic applications. Researchers utilize RU-521 to explore its impact on cellular processes, such as inflammation or cell signaling, which may contribute to the development of new treatments for diseases. Its application is largely confined to preclinical studies, where it serves as a valuable tool for investigating molecular mechanisms and drug discovery.