Used as a key intermediate in the synthesis of pharmaceutical agents, particularly acridine-based derivatives with potential antitumor, antimicrobial, and acetylcholinesterase inhibitory properties. It is essential in the preparation of compounds like tacrine for Alzheimer's disease treatment, as well as DNA-intercalating agents valuable in cancer research and chemotherapeutic design. The acridine core also supports investigations into enhancing photodynamic therapy efficacy due to its affinity for nucleic acids.