Used primarily as an intermediate in organic synthesis, especially in the preparation of heterocyclic compounds. It plays a key role in the synthesis of indoles and related structures through cyclization reactions. Commonly employed in pharmaceutical manufacturing for building complex ring systems found in bioactive molecules. Also utilized in the development of dyes and fluorescent agents due to its aromatic and functional group versatility. Its aldehyde and ester functionalities allow for selective reactions, making it valuable in multi-step synthetic pathways.