The chemical Mephenytoin has a known molecular formula of C12-H14-N2-O2. Synonyms may include: 5-24-08-00093 (Beilstein Handbook Reference), BRN 0017282, EINECS 200-012-8, Epiazin, Epilan, 5-Ethyl-5-fenyl-3-methylhydantoin [Czech], 5-Ethyl-3-methyl-5-phenylhydantoin, 5-Ethyl-3-methyl-5-phenyl-2,4(3H,5H)-imidazoledione, 5-Ethyl-3-methyl-5-phenylimidazolidin-2,4-dione, 5-Ethyl-3-methyl-5-phenyl-2,4-imidazolidinedione (ChemID).