Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and anti-cancer agents. Its structure supports the construction of complex heterocyclic systems found in biologically active molecules. Commonly employed in medicinal chemistry for modifying indole cores to enhance binding affinity and selectivity toward specific enzyme targets. Also utilized in the preparation of fluorescent probes due to its aldehyde functionality, enabling conjugation with biomolecules for imaging applications.