TrxR inhibitor D9 is primarily used in research to study the role of thioredoxin reductase (TrxR) in cellular processes. It is particularly valuable in cancer research, where it helps to understand the mechanisms of oxidative stress and redox signaling in tumor cells. By inhibiting TrxR, it can induce apoptosis in cancer cells, making it a potential candidate for developing anticancer therapies. Additionally, it is utilized in studies focused on neurodegenerative diseases, as TrxR plays a role in protecting cells from oxidative damage. Its application extends to exploring inflammatory pathways and immune responses, providing insights into diseases where oxidative stress is a contributing factor.