STAT3 inhibitor 3 is primarily used in research and therapeutic contexts to target the STAT3 signaling pathway, which plays a critical role in cancer cell proliferation, survival, and immune evasion. By inhibiting STAT3, this compound helps suppress tumor growth and metastasis, making it a potential candidate for cancer treatment. It is also studied for its role in modulating inflammatory responses, as STAT3 is involved in various inflammatory diseases. Additionally, it is utilized in preclinical studies to understand the molecular mechanisms of STAT3-dependent pathways and to develop novel therapeutic strategies for diseases where STAT3 is dysregulated.