Used as a key intermediate in the synthesis of non-steroidal anti-inflammatory drugs (NSAIDs), particularly in the production of phenylbutazone and related derivatives. Its structure allows for effective binding and modification to enhance pharmacological activity. Commonly employed in pharmaceutical research and development for optimizing anti-inflammatory and analgesic agents. Also utilized in dye synthesis due to its aromatic and sulfonic acid groups, contributing to water solubility and stability in colored compounds.