Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of isoquinoline-based compounds with potential biological activity. It serves as a building block in medicinal chemistry for creating kinase inhibitors and antimicrobial agents. The presence of multiple halogen atoms allows for selective cross-coupling reactions, enabling the introduction of various functional groups during drug discovery processes. Also employed in research settings to develop fluorescent probes and organic semiconductors due to its aromatic structure and electron-withdrawing properties.