... 110-17-8). A food acidulen and fumaric acid esters used to treat psoriasis. Fumaric acidIUPAC name ... : trans-1,2-Ethylenedicarboxylic acid,2-Butenedioic acid, trans-butenedioic acid, Allomaleic acid, Boletic acid, Donitic acid, Lichenic acidIdentifiers CAS number: ... .44HazardsEU classification: Irritant (Xi)ApplicationsFumaric acid is a food acidulen and fumaric acid esters are used to treat psoriasis ...