Used in organic synthesis as an intermediate for pharmaceuticals and bioactive compounds. Serves as a building block in the development of indole-based drugs, particularly in research targeting central nervous system disorders and inflammation. Its structure supports the design of serotonin receptor modulators. Also applied in the preparation of fluorescent probes and dyes due to the indole core’s photophysical properties. Common in medicinal chemistry for structure-activity relationship (SAR) studies involving tryptophan derivatives.