
1) Simple aromatic ring
Found on
https://www.crosswordclues.com/clue/indole

Indole is an aromatic heterocyclic organic compound. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. Indole is widely distributed in the natural environment and can be produced by a variety of bacteria. As an intercellular signal molecule, indole regulates various as...
Found on
http://en.wikipedia.org/wiki/Indole

a heterocyclic organic compound occurring in some flower oils, such as jasmine and orange blossom, in coal tar, and in fecal matter. It is used in ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/i/19

1. 2,3-Benzopyrrole;basis of many biologically active substances (e.g., serotonin, tryptophan); formed in degradation of tryptophan. ... Synonym: ketole. ... 2. Any of many alkaloids containing the indole structure. ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973

(in´dōl) a compound obtained from coal tar and indigo and produced by decomposition of tryptophan in the intestine, where it contributes to the peculiar odor of feces. It is excreted in the urine in the form of indican.
Found on
http://www.encyclo.co.uk/local/21001

Side chain group of amino acid tryptophan
Found on
http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: in′dōl Definitions: 1. basis of many biologically active substances (serotonin, tryptophan); formed in degradation of tryptophan. 2. Any of many alkaloids containing the indole (1) structure. Synonyms: ketole
Found on
http://www.medilexicon.com/medicaldictionary.php?t=44266

a colorless to yellowish solid, CHN, having a low melting point and a fecal odor, found in the oil of jasmine and clove and as a putrefaction product from animals' intestines: used in perfumery and as a reagent.
Found on
https://www.infoplease.com/dictionary/indole
No exact match found.