Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in the preparation of active pharmaceutical ingredients (APIs) due to its reactive amine group and stable isoindoline dione core. Its structure allows for further functionalization, making it valuable in medicinal chemistry for structure-activity relationship (SAR) studies. Also employed in the production of dyes and fluorescent probes because of its aromatic and electron-rich properties.