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Indole
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<p>Indole is an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the formula C6H4CCNH3. Indole is classified as an <a href="/facts/Aromatic/wK0DzRY6">aromatic</a> <a href="/facts/Heterocyclic_compound/8oYSjJxY">heterocycle</a>. It has a <a href="/facts/Bicyclic/WfstMqT6">bicyclic</a> structure, consisting of a six-membered <a href="/facts/Benzene/Fguue7nr">benzene</a> ring fused to a five-membered <a href="/facts/Pyrrole/7c7AbyN8">pyrrole</a> ring. Indoles are derivatives of indole where one or more of the hydrogen atoms have been replaced by <a href="/facts/Substituent/6y9IE6G0">substituent</a> groups. Indoles are widely distributed in nature, most notably as <a href="/facts/Amino_acid/WDxYwBny">amino acid</a> <a href="/facts/Tryptophan/JcUxlxAh">tryptophan</a> and <a href="/facts/Neurotransmitter/LlpYFSU3">neurotransmitter</a> <a href="/facts/Serotonin/EzY58q4a">serotonin</a>. </p>