Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of isoquinoline-based bioactive compounds. Its aldehyde functional group allows for easy modification, enabling the formation of Schiff bases, imines, and other derivatives important in medicinal chemistry. Commonly employed in the production of kinase inhibitors and central nervous system agents due to the structural similarity to natural alkaloids. Also utilized in research settings for the design of fluorescent probes and imaging agents, leveraging the inherent aromaticity and electronic properties of the isoquinoline core.