MS 209 1-Piperazineethanol, 4-(diphenylacetyl)-alpha-((5-quinolinyloxy)methyl)-, (E)-2-butenedioate (2:3) (salt) 4-(Diphenylacetyl)-alpha-((5-quinolinyloxy)methyl)-1-piperazineethanol (E)-2-butenedioate (2:3) (salt) Dofequidar fumarate 4-(Diphenylacetyl)-a-[(5-quinolinyloxy)methyl]-1-Piperazineethanol (E)-2-butenedioate fumarate (1:1.5) MS-209 fumarate Dofequidar fumarate >=98% (HPLC) Dofequidar (sesquifumarate)