IDO-IN-1 is primarily used in research settings to study the role of indoleamine 2,3-dioxygenase (IDO) in various biological processes. It acts as an inhibitor of IDO, an enzyme involved in the metabolism of tryptophan, which plays a critical role in immune regulation and tumor evasion. Researchers utilize IDO-IN-1 to investigate its potential in modulating immune responses, particularly in cancer immunotherapy. By blocking IDO activity, it helps in understanding how to enhance the immune system's ability to recognize and attack cancer cells. Additionally, it is employed in studies related to autoimmune diseases and inflammatory conditions, where IDO activity is implicated. Its application extends to preclinical models to evaluate therapeutic strategies targeting the IDO pathway.