STING agonist-1 (compound 3) trihydrochloride is primarily utilized in immunotherapy research, particularly in the activation of the STING (Stimulator of Interferon Genes) pathway. This pathway plays a crucial role in the immune system's response to infections and cancer. The compound is used to enhance the body's innate immune response, making it a valuable tool in the development of cancer vaccines and treatments. Researchers apply it to stimulate the production of type I interferons, which are essential for anti-tumor immunity. Additionally, it is employed in preclinical studies to evaluate its efficacy in combination with other immunotherapies, aiming to improve outcomes in various cancer types. Its role in modulating immune responses also extends to studies on infectious diseases, where it helps in understanding and potentially enhancing the body's defense mechanisms against pathogens.