The chemical Mifepristone has a designated molecular formula of C29H35NO2 and a molecular weight of 429.604 g/mol. Synonyms may include: R 38486, BRN 5779404, 11beta-(4-(N,N-Dimethylamino)phenyl)-17alpha-(prop-1-ynyl)-delta4,9-estradiene-17beta-ol-3-one, HSDB 6841, 17-beta-Hydroxy-11-beta-(4-dimethylaminophenyl-1)-17-alpha-(prop-1-ynyl)oestra-4,9-dien-3-one, Mifegyne, Mifepristona [Spanish], Mifepristonum [Latin], RU 38486, RU 486 (ChemID). Mifepristone has been assigned a MeSH pharmacological action of: Hormone Antagonist.