Used primarily as an intermediate in organic synthesis, especially in the pharmaceutical industry for constructing sulfonamide-based drugs. Its sulfonyl chloride group readily reacts with amines to form sulfonamides, which are key structural motifs in many bioactive molecules, including antimicrobial and anti-inflammatory agents. The methylthio substituent can act as a directing group in electrophilic aromatic substitution or be further modified to thioethers, sulfoxides, or sulfones, expanding its utility in synthetic pathways. Also employed in the development of agrochemicals and functional materials due to its reactivity and stability as a building block.