Used in the treatment of autoimmune diseases such as rheumatoid arthritis and psoriasis due to its potent inhibition of Janus kinase (JAK) enzymes, particularly JAK1. This compound helps reduce inflammation by blocking signaling pathways involved in immune cell activation. It has shown efficacy in clinical trials for improving symptoms and slowing disease progression in patients unresponsive to conventional therapies. Its selectivity for JAK1 minimizes off-target effects, contributing to a more favorable safety profile compared to broader immunosuppressants.