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Fumaric Acidundefined Fumaric acid or trans-butenedioic acid is the chemical compound with the formula HO2CCH=CHCO2H. This white crystalline compound is one of two isomeric unsaturateddicarboxylic acids, the other being maleic acid. In fumaric acid the carboxylic acid groups aretrans (E) and in maleic acid they are cis (Z). Fumaric acid has a fruit-like taste. The salts andesters are known as fumarates
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