Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of serotonin receptor modulators and other central nervous system agents. It serves as a building block for indole-based compounds with potential antidepressant, antipsychotic, or anti-migraine activity. Also applied in the preparation of functional materials and dyes due to its aromatic amine structure. Its fused ring system makes it valuable in medicinal chemistry for designing bioactive molecules.