Used as an intermediate in the synthesis of sulfa drugs and other pharmaceuticals, particularly in the development of sulfonamide-based antibiotics. Its reactive sulfonyl chloride and ester functional groups allow for sequential derivatization, enabling the construction of complex molecules in medicinal chemistry. Commonly employed in the preparation of carbonic anhydrase inhibitors and anti-tumor agents due to its ability to act as a building block for sulfonamide-containing compounds. Also utilized in agrochemical synthesis for creating herbicides and plant growth regulators.