Used as a key intermediate in the synthesis of biologically active compounds, particularly in pharmaceuticals and agrochemicals. Its sulfonyl chloride group readily reacts with amines and alcohols, making it valuable for constructing sulfonamide and sulfonate ester derivatives. Commonly employed in medicinal chemistry for developing kinase inhibitors and other targeted therapies. The electron-withdrawing trifluoromethyl and quinoline groups enhance binding selectivity and metabolic stability in drug candidates. Also utilized in the preparation of fluorescent probes and functional materials due to its rigid aromatic structure and strong electron affinity.