Used as a key intermediate in the synthesis of fluorescent dyes and optical brighteners due to its ability to form stable complexes with metal ions and its strong UV absorption properties. Commonly employed in the development of sensors for metal ion detection, especially aluminum and zinc, in environmental and biological samples. Also utilized in the preparation of naphthalimide derivatives, which have applications in organic electronics and as bioimaging agents. Its hydroxyl and carboxylic acid groups allow for easy functionalization, making it valuable in pharmaceutical research for building more complex molecules with potential antimicrobial or anti-inflammatory activity.