PERFLUORO(2-ETHOXYETHANE)SULFONYL FLUORIDE PERFLUORO(2-ETHOXYETHANE)SULPHONYL FLUORIDE TETRAFLUORO-2-(PENTAFLUOROETHOXY)ETHANESULFONYL FLUORIDE PERFLUORO(2-ETHOXYETHANE)SULFONYL FLUORIDE 95% 1,1,2,2-tetrafluoro-2-(1,1,2,2,2-pentafluoroethoxy)ethanesulfonyl fluoride Ethanesulfonyl fluoride, 1,1,2,2-tetrafluoro-2-(1,1,2,2,2-pentafluoroethoxy)-