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Furaneol (keto form), also known as 2,5-dimethyl-4-hydroxy-3(2h)-furanone or hdmf, is a member of the class of compounds known as furanones. Furanones are compounds containing a furan ring bearing a ketone group. Furaneol (keto form) is soluble (in water) and a very weakly acidic compound (based on its pKa). Furaneol (keto form) can be found in a number of food items such as globe artichoke, nuts, quinoa, and purslane, which makes furaneol (keto form) a potential biomarker for the consumption of these food products.

A 4-oxo monocarboxylic acid anion that is the conjugate base of 3-oxocyclopentanecarboxylic acid, obtained by deprotonation of the carboxy group." []

2-oxohex-4-enoate is a 2-oxo monocarboxylic acid anion. It is a conjugate base of a 2-oxohex-4-enoic acid.

A 4-oxo monocarboxylic acid anion that is the conjugate base of 3-oxocyclopentanecarboxylic acid, obtained by deprotonation of the carboxy group." []

A monocarboxylic acid anion resulting from the removal of a proton from the carboxy group of (2Z,4Z)-2-hydroxyhexa-2,4-dienoic acid." []

An organic anion that is the conjugate base of 4-hydroxy-2,5-dimethyl-3-furanone, obtained by deprotonation of the hydroxy group with concomitant keto/enol-type tautomerisation. It is thought to be a major microspecies at pH 7.3." []

An organic anion that is the conjugate base of dihydrophloroglucinol, obtained by deprotonation of the enolic hydroxy group; major species at pH 7.3." []