Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and antitumor agents. Its structure allows for selective functionalization, making it valuable in medicinal chemistry for constructing quinoline-based bioactive molecules. It is also employed in the preparation of fluorescent probes due to its aldehyde group and aromatic framework, which can be modified to detect specific biological molecules. Additionally, it serves as a building block in the creation of agrochemicals and heterocyclic compounds with potential biological activity.