Used as a key intermediate in the synthesis of sulfa drugs and other biologically active sulfonamide compounds. Its sulfonyl fluoride group readily reacts with amines, making it valuable in medicinal chemistry for constructing sulfonamide linkages found in antimicrobial and anti-inflammatory agents. Also employed in chemical biology as a labeling reagent for proteins and enzymes due to the selective reactivity of the sulfonyl fluoride moiety with active-site residues. Its methoxy and amino groups allow for further functionalization, enabling use in multi-step organic syntheses and the development of specialty chemicals.