Used primarily as a key intermediate in the synthesis of pharmaceuticals and agrochemicals. Its fluorosulfonyl group enables selective functionalization in complex molecule construction, particularly in the development of sulfonyl-containing bioactive compounds. It serves in peptide modification and labeling due to the reactivity of the sulfonyl fluoride moiety, which can form stable bonds with nucleophilic amino acid residues. Also applied in materials science for creating fluorinated polymers with enhanced thermal and chemical stability. Its carboxylic acid functionality allows for further derivatization, making it valuable in combinatorial chemistry and drug discovery.