Used as a key intermediate in the synthesis of fluorescent dyes and optical brighteners due to its strong fluorescence properties. Commonly applied in the development of sensors for metal ions and biomolecules, leveraging its ability to undergo fluorescence quenching or enhancement upon binding. Also utilized in pharmaceutical research for constructing quinoline-based bioactive molecules, including antimalarial and anticancer agents. Its carboxylic acid and amino functional groups allow easy derivatization for use in peptide coupling and bioconjugation techniques.