Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and other biologically active compounds. It serves as a building block in medicinal chemistry due to its ability to form amide and imide bonds, enabling the construction of heterocyclic frameworks common in drug molecules. Commonly employed in research settings for the preparation of fluorescent probes and labeling reagents owing to its reactive anhydride group. Also utilized in the development of agrochemicals and functional materials where aromatic scaffolds with defined substitution patterns are required.