Fumaric acid

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What Wikipedia says

Fumaric acid or trans-butenedioic acid is an organic compound with the formula HO2CCH=CHCO2H. A white solid, fumaric acid occurs widely in nature. It has a fruit-like taste and has been used as a food additive. Its E number is E297. The salts and esters are known as fumarates.

Excerpt from the Wikipedia article “Fumaric acid”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ben Mills, Public domain, via Wikimedia Commons.