- Indoxyl ß-d-glucoside from Indigofera species and Polygonium tinctorium; a source of indigo.
- 3-indoxylsulfuric acid, a substance found (as its salts) in sweat and in variable amounts in urine; indicative, when in quantity, of protein putrefaction in the intestine (indicanuria).
Synonym(s): plant indican
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Examples: glitazone, GI cocktail, etc.