Used as an intermediate in the synthesis of sulfa drugs and other pharmaceuticals, particularly in the development of anti-inflammatory and antimicrobial agents. Its chlorosulfonyl group enables easy attachment to amines, forming sulfonamide derivatives, which are key structural motifs in many bioactive molecules. Also employed in agrochemical synthesis for creating herbicides and plant growth regulators. Its methoxy and ester functionalities allow further chemical modifications, making it valuable in medicinal chemistry research and development.