Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of antiviral and anticancer agents. It serves as a building block in heterocyclic chemistry due to its fused ring system, which enhances binding affinity to biological targets. Employed in the preparation of fluorescent dyes and optical brighteners because of its favorable photophysical properties. Also applied in agrochemicals for the formulation of pesticides and herbicides, leveraging its stability and reactivity. Commonly used in research for designing sensors and molecular probes, especially for metal ion detection.