Used in organic synthesis as an intermediate for pharmaceuticals and biologically active compounds. Its structure supports the development of nitrogen-containing heterocyclic systems, commonly found in medicinal agents. Frequently employed in the preparation of kinase inhibitors and antimicrobial agents. Also utilized in research settings for the synthesis of fluorescent dyes and sensors due to the isoquinoline core’s photophysical properties. Common in drug discovery programs targeting central nervous system disorders and cancer therapies.