4-Piperidinecarboxylic acid, 3,5-bis((dipropylamino)methyl)-4-phenyl-1-propyl-, ethyl ester, ethanedioate 70436-32-7 Isonipecotic acid, 3,5-bis((dipropylamino)methyl)-4-phenyl-1-propyl-, ethyl ester, oxalate