MDR-1339 is primarily utilized in the field of medical research, particularly in studies related to drug resistance. It is often employed as a tool compound to investigate mechanisms of multidrug resistance in cancer cells. Researchers use MDR-1339 to understand how certain cells develop resistance to chemotherapy agents, which can help in the development of new strategies to overcome this resistance. Additionally, it is used in preclinical studies to evaluate the efficacy of potential therapeutic agents in overcoming multidrug resistance, making it a valuable asset in the ongoing battle against cancer and other diseases where drug resistance is a significant challenge.