Used in the synthesis of pharmaceutical intermediates, particularly in the development of indole-based bioactive compounds. Serves as a key building block in the preparation of fluorescent probes due to its electron-withdrawing nitro group and aldehyde functionality, enabling conjugation and detection in biological systems. Employed in organic research for constructing complex heterocyclic frameworks via condensation or cyclization reactions. Its structure supports the development of sensors and dyes with potential applications in imaging and material science.