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Allantoic acid in which one of the aminocarbonyl groups is replaced by hydrogen." []

4-Hydroxybenzeneacetonitrile is found in herbs and spices. 4-Hydroxybenzeneacetonitrile is isolated from white mustard (Brassica alba) as a decomposition product of 4-Hydroxybenzyl glucosinolate KZZ54-K

4-hydroxyindole is a member of the class of hydroxyindoles that is 1H-indole substituted by a hydroxy group at position 4. It is a member of phenols and a member of hydroxyindoles. 4-Hydroxyindole is a natural product found in Solanum lycopersicum with data available.

1,3-Dihydro-(2H)-indol-2-one, also known as 2-oxindole or 2-indolinone, belongs to the class of organic compounds known as indolines. Indolines are compounds containing an indole moiety, which consists of pyrrolidine ring fused to benzene to form 2,3-dihydroindole.

Indoxyl, also known as 1H-indol-3-ol, belongs to the class of organic compounds known as hydroxyindoles. These are organic compounds containing an indole moiety that carries a hydroxyl group. Indoxyl is isomeric with oxindol and is obtained as an oily liquid. Indoxyl exists in all living organisms, ranging from bacteria to humans. Indoxyl is obtained from indican, which is a glycoside. Obermayer's reagent is a dilute solution FeCl3 in hydrochloric acid. The hydrolysis of indican yields β-D-glucose and indoxyl. Indigo dye is a product of the reaction of indoxyl by a mild oxidizing agent such as atmospheric oxygen. In chemistry, indoxyl is a nitrogenous substance with the chemical formula: C8H7NO. Indoxyl can be found in urine and is titrated with Obermayer's reagent.

Mandelonitrile is a chemical compound of the cyanohydrin class. Small amounts of mandelonitrile occur in the pits of some fruits. (Wikipedia)

2-Methyl-4,5-benzoxazole is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")

A 2-hydroxy fatty acid anion that is the conjugate base of 2,2-dihydroxy-3-methylbutanoic acid resulting from the deprotonation of the carboxy group. Major microspecies at pH 7.3." []

The zwitterion resulting from the transfer of a proton from the carboxy group to the alpha-amino group of 2-ureidoglycine." []

The zwitterion resulting from the transfer of a proton from the carboxy group to the alpha-amino group of (S)-2-ureidoglycine." []