Used in pharmaceutical research as a key intermediate in the synthesis of biologically active compounds, particularly in the development of kinase inhibitors and anticancer agents. Exhibits utility in medicinal chemistry for modifying isoquinoline-based structures to enhance binding affinity and selectivity toward specific enzyme targets. Also employed in the design of receptor agonists and antagonists due to its ability to interact with central nervous system targets. Its hydrochloride salt form improves solubility and stability, making it suitable for in vitro and in vivo studies.