Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of antitumor and antiviral agents. Its aldehyde functionality allows for easy modification, making it valuable in constructing complex heterocyclic systems. Commonly employed in condensation reactions to form Schiff bases or in nucleophilic addition reactions to introduce side chains in drug candidates. Also utilized in the preparation of fluorescent probes due to its conjugated structure, which can enhance optical properties in sensor molecules.