Y-320 is primarily utilized in the field of biochemistry and pharmacology as a selective inhibitor of interleukin-1 receptor-associated kinase 4 (IRAK-4). This application is crucial in research focused on understanding and modulating immune responses, particularly in inflammatory and autoimmune diseases. By inhibiting IRAK-4, Y-320 helps in studying the signaling pathways involved in the immune system, providing insights into potential therapeutic strategies for conditions like rheumatoid arthritis, lupus, and other inflammatory disorders. Additionally, it serves as a valuable tool in preclinical studies to evaluate the efficacy and safety of new drugs targeting IRAK-4 pathways.