Used primarily in research as a potent and selective inhibitor of Janus kinase 1 (JAK1), this compound plays a key role in studying inflammatory and autoimmune diseases. It helps modulate cytokine signaling pathways involved in conditions like rheumatoid arthritis, psoriasis, and inflammatory bowel disease. Due to its selectivity for JAK1 over other JAK family members, it is valuable in reducing off-target effects during preclinical studies. It is also employed in cancer research, particularly in malignancies driven by dysregulated JAK-STAT signaling. Commonly used in cellular assays and animal models, it aids in validating JAK1 as a therapeutic target and supports the development of new oral treatments for chronic inflammatory disorders.