Used in the synthesis of pharmaceuticals and biologically active compounds, particularly in the development of kinase inhibitors and central nervous system agents. Serves as a building block in medicinal chemistry due to its fused heterocyclic structure, which supports binding to various enzyme active sites. Also employed in the preparation of dyes and fluorescent probes for biochemical imaging. Its amine functionality allows for easy derivatization, making it valuable in combinatorial chemistry and drug discovery research.