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3,4-dihydroxyphthalic acid is a hydroxybenzoic acid. It is functionally related to a phthalic acid. It is a conjugate acid of a 3,4-dihydroxyphthalate(2-).

4,5-dihydroxyphthalic acid is a hydroxybenzoic acid. It is functionally related to a phthalic acid. It is a conjugate acid of a 4,5-dihydroxyphthalate(2-).

4-maleyl-acetoacetate is slightly soluble (in water) and a moderately acidic compound (based on its pKa). 4-maleyl-acetoacetate can be found in a number of food items such as grass pea, vanilla, burdock, and pomegranate, which makes 4-maleyl-acetoacetate a potential biomarker for the consumption of these food products.

A dicarboxylic acid dianion resuting from removal of a proton from both carboxy groups of 4-fumarylacetoacetic acid." []

Conjugate base of (3S,4R)-3,4-dihydroxycyclohexa-1,5-diene-1,4-dicarboxylic acid." []

Dicarboxylate anion of 5-formyl-2-hydroxyhepta-2,4-dienedioic acid; major species at pH 7.3." []

A dicarboxylic acid dianion arising from deprotonation of the carboxy groups of cis-4,5-dihydroxycyclohexa-2,6-diene-1,2-dicarboxylic acid; major species at pH 7.3." []

Conjugate base of (3S,4R)-3,4-dihydroxycyclohexa-1,5-diene-1,4-dicarboxylic acid." []

Dicarboxylate anion of 5-formyl-2-hydroxyhepta-2,4-dienedioic acid; major species at pH 7.3." []

A dicarboxylic acid dianion arising from deprotonation of the carboxy groups of cis-4,5-dihydroxycyclohexa-2,6-diene-1,2-dicarboxylic acid; major species at pH 7.3." []

A hydroxybenzoic acid that is isophthalic acid (benzene-1,3-dicarboxylic acid) in which the hydrogens at positions 4 and 5 have been replaced by hydroxy groups. An inhibitor of brain glutamate decarboxylase." []

2,5-Dihydroxyterephthalic acid is a natural product found in Inonotus obliquus with data available.