IDO-IN-6 is primarily utilized in the field of medical research, particularly in the study of immunology and cancer therapy. It acts as an inhibitor of indoleamine 2,3-dioxygenase (IDO), an enzyme that plays a significant role in immune suppression within the tumor microenvironment. By blocking IDO, this compound helps to enhance the immune system's ability to recognize and attack cancer cells, making it a promising candidate for immunotherapy. Researchers also explore its potential in treating diseases where immune tolerance is a factor, such as autoimmune disorders and chronic infections. Its application extends to preclinical studies aimed at understanding the mechanisms of immune evasion and developing novel therapeutic strategies.