Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of indole-based drugs which exhibit biological activity such as antitumor, antiviral, and anti-inflammatory effects. It serves as a building block in medicinal chemistry for constructing complex heterocyclic systems. Its nitro and chloro functional groups allow for further chemical modifications, enabling the creation of diverse compound libraries for drug discovery. Also employed in research settings to develop fluorescent probes and dyes due to the indoline backbone’s favorable photophysical properties.