Used primarily in research settings as an intermediate for synthesizing biologically active compounds. It serves as a key building block in the development of pharmaceuticals targeting neurological pathways, particularly in the study of receptor antagonists. Its structure supports the creation of more complex molecules with potential activity in the central nervous system. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to its rigid isoquinoline framework. Also utilized in the preparation of selective inhibitors for enzyme targets involved in neurodegenerative diseases.