Used as a key intermediate in the synthesis of fluorescent dyes and optical brighteners due to its strong electron-withdrawing nitrile and nitro groups combined with the electron-donating ethoxy and hydroxy functionalities. Its conjugated structure allows for tunable absorption and emission properties, making it valuable in the development of sensors and probes for detecting metal ions or pH changes in environmental and biological systems. Also employed in the preparation of quinoline-based pharmaceuticals with potential antimicrobial and antitumor activities. Its photostability and reactivity support use in photochemical research and materials science, particularly in designing organic semiconductors and light-emitting compounds.