Used as an intermediate in the synthesis of non-steroidal anti-inflammatory drugs (NSAIDs), particularly in the production of indomethacin and related compounds. It serves as a key building block due to its ability to form ester and amide derivatives that are integral to the pharmacologically active structure of these drugs. Also employed in the development of dyes and surfactants where its sulfonic acid group enhances water solubility and stability. Its reactivity allows for easy functionalization in multi-step organic syntheses, making it valuable in pharmaceutical and fine chemical industries.