(3,4'-Bipyridine)-3',5'-dicarboxylic acid, 1',4'-dihydro-2',6'-dimethyl-2-(trifluoromethyl)-,2-(4-(4-(diphenylmethyl)-1-piperazinyl)phenyl)ethyl methyl ester, (E)-2-butenedioate (2:1) 116308-54-4