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  • Hello Fumaric acid (IUPAC systematic name: 2-butenedioic acid), also called allomaleic acid, boletic acid or lichenic acid, is a colorless crystalline flammable carboxylic acid based on butene and molecular formula C4H4O4. Irritating maleic anhydride fumes are produced by its combustion. Having a fruitlike taste, it is found in fumitory (Fumaria officinalis), bolete mushrooms (specifically Boletus fomentarius var. pseudo-igniarius), lichen, and Iceland moss. http://en.wikipedia.org/wiki/Fumaric_acid

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