Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and central nervous system agents. Its aldehyde functionality allows for easy derivatization, making it valuable in constructing complex heterocyclic systems. Commonly employed in medicinal chemistry for structure-activity relationship studies due to its rigid indoline scaffold and ability to mimic bioactive conformations. Also utilized in the preparation of fluorescent probes and functional materials where aromatic aldehydes serve as building blocks.