Synonyms: Butanoic acid, 4-((3-(dimethylamino)propyl)amino)-4-oxo-, 2(or 3)-((gamma-omega-perfluoro-C6-20-alkyl)thio) derivs.;N-(N',N'-Dimethylaminopropyl)-2(3)-(1,1,2,2-tetrahydroperfluoroalkyl(C6-C20)thio)succinamic acid;Butanoic acid, 4-((3-(dimethylamino)propyl)amino)-4-oxo-, 2(or 3)-((gamma-omega-perfluoro-C6-2O-alkyl)thio) derivs.