fumaric acid

== English == === Etymology === From Fumaria. === Noun === fumaric acid (countable and uncountable, plural fumaric acids) (organic chemistry) an unsaturated organic dicarboxylic acid, HOOCCH=CHCOOH, the geometric isomer of maleic acid from which it may be prepared by heating; it is found in many plants, including fungi and mosses, and is essential in the chemistry of respiration; it has a number of industrial applications, and its esters, the fumarates, are used in the treatment of psoriasis ==== Synonyms ==== trans-butenedioic acid E297 when used as an acidity regulator