Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and antiviral agents. Its dual reactive groups—the 2-chloride for nucleophilic aromatic substitution and the 5-carbonyl chloride for acylation—enable easy attachment to other molecular frameworks, making it valuable in constructing complex heterocyclic compounds. Commonly employed in agrochemical research for creating novel pesticides and herbicides due to its ability to enhance bioactivity. Also utilized in materials science for modifying organic semiconductors and developing functional polymers.