Used as a key 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 bioactive molecules due to its ability to undergo selective substitutions at the 4 and 6 positions. Its indolinone core is valuable in medicinal chemistry for designing compounds with anti-inflammatory, antiviral, and antiproliferative activities. Also employed in research for developing novel heterocyclic compounds with potential therapeutic applications.