Used primarily as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of radiolabeled agents for medical imaging. Its structure allows for easy incorporation of iodine-123 or iodine-131, making it valuable in creating tracers for single-photon emission computed tomography (SPECT). It is also employed in the preparation of sulfonamide-based bioactive molecules, where the sulfonyl chloride group reacts selectively with amines to form stable sulfonamide bonds. Due to its reactivity, it facilitates the construction of complex organic molecules in medicinal chemistry research, especially in CNS-targeted drug discovery and oncology-related compounds.