Used in organic synthesis as an intermediate for pharmaceuticals and bioactive compounds. Serves as a building block in the development of serotonin receptor ligands and psychoactive substance analogs. Employed in research settings to study indole-based molecular structures with potential neurological activity. Also utilized in the preparation of fluorescent dyes and sensors due to the indole core’s photophysical properties. Common in medicinal chemistry for structure-activity relationship (SAR) studies involving substituted indoles.