Perfluoro(2-ethoxyethane)sulfonic acid113507-82-7100 % similar Perfluorobutanesulfonic acid375-73-552 % similar Perfluorooctanesulfonic acid1763-23-150 % similar Perfluorohexanesulfonic acid355-46-450 % similar Perfluoroheptanesulfonic acid375-92-850 % similar Ammonium perfluorooctylsulfonate29081-56-946 % similar Triflic acid1493-13-638 % similar 1,1,2,2-Tetrafluoro-2-(1,1,2,2-tetrafluoro-2-iodoethoxy)ethanesulfonyl fluoride66137-74-438 % similar 2-Hydroxytetrafluoroethanesulfonic acid β-sultone697-18-734 % similar 2-[1-[Difluoro[(1,2,2-trifluoroethenyl)oxy]methyl]-1,2,2,2-tetrafluoroethoxy]-1,1,2,2-tetrafluoroethanesulfonyl fluoride16090-14-533 % similar 3-(Trifluoromethyl)-3,4,4-trifluoro-1-oxa-2-thiacyclobutane 2,2-dioxide773-15-931 % similar Nonafluorobutanesulfonic acid anhydride36913-91-431 % similar