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Fumaric acid or trans-butenedioic acid, is the chemical compound with the formula HO2CCH=CHCO2H.
This white crystalline compound is one of two isomeric unsaturated dicarboxylic acids, the other being maleic acid, wherein the carboxylic acid groups are cis. It has a fruit-like taste. The salts and esters of fumaric acid are known as fumarates.