The chemical Maleic acid has a designated molecular formula of C4H4O4 and a molecular weight of 116.072 g/mol. Synonyms may include: 4-02-00-02199 (Beilstein Handbook Reference), AI3-01002, BRN 0605762, cis-Butenedioic acid, Butenedioic acid, (Z)-, 2-Butenedioic acid, (Z)-, CCRIS 1115, EINECS 203-742-5, cis-1,2-Ethylenedicarboxylic acid, 1,2-Ethylenedicarboxylic acid (ChemID). Maleic acid has been assigned a MeSH pharmacological action of: Enzyme Inhibitor.