Used primarily as an intermediate in the synthesis of pharmaceuticals and agrochemicals. Its reactive chlorosulfonyl and bromo groups allow for selective functionalization, making it valuable in building complex organic molecules. Commonly employed in the preparation of sulfonamide derivatives, which are key structural motifs in various bioactive compounds, including antimicrobial and anti-inflammatory agents. Also utilized in the development of crop protection chemicals due to its ability to introduce specific substituents into aromatic systems. Its ester group facilitates further transformation, enabling its use in multi-step synthetic routes.