Used in the synthesis of fluorescent dyes and optical brighteners due to its conjugated aromatic structure and ability to emit light under UV radiation. It serves as a key intermediate in developing sensors for metal ion detection, especially for aluminum and zinc in environmental and biological samples. Also employed in pharmaceutical research for designing kinase inhibitors and anti-cancer agents, leveraging its quinoline scaffold which shows affinity for biological targets. Its carboxylic acid and amine groups allow easy functionalization for creating compound libraries in drug discovery. Additionally, it finds use in materials science for developing organic semiconductors and light-emitting diodes (OLEDs).