Used primarily as an intermediate in organic synthesis, especially in the preparation of fluorescent dyes and biologically active compounds. Its reactivity allows it to form amide and ester derivatives, which are valuable in developing pharmaceuticals with antimicrobial or anticancer properties. Commonly employed in the synthesis of acridine-based DNA intercalators, making it significant in biochemical research and drug development. Also utilized in the creation of sensors and probes due to the inherent fluorescence of acridine derivatives, aiding in the detection of biomolecules and metal ions.