The chemical Ferrous fumarate has a known molecular formula of C4-H4-O4.Fe. Synonyms may include: 2-Butenedioic acid (E)-, iron(2+) salt (1:1), CCRIS 6896, Cpiron, EINECS 205-447-7, Erco-Fer, Ercoferro, Feostat, Feroton, Ferrofume, Ferronat, Ferrone (ChemID).