Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in medicinal chemistry due to its reactive bromo group, which allows for further functionalization via cross-coupling reactions such as Suzuki or Heck reactions. Its indolinone core is commonly found in bioactive molecules, making it valuable in drug discovery programs targeting neurological disorders and inflammatory diseases. Also employed in the preparation of fluorescent probes and labeled compounds for biochemical assays.