Indole
Indole is a heterocyclic compound made from the condensation of a benzene ring and a pyrrole ring. Its chemical formula is C8H7N.
Although it is used as a fragrance at very low concentration, a highly-concentrated level expelled an excrement-like fetid odor.
Although industrial use of indole is limited, it is a structural component in tryptophan that is one of the essential amino acids.
