2,3,3,3-Tetrafluoro-2-(1,1,2,2-tetrafluoro-2-(fluorosulphonyl)ethoxy)propionyl fluoride 4089-57-0 EINECS 223-823-9 Propanoyl fluoride, 2,3,3,3-tetrafluoro-2-(1,1,2,2-tetrafluoro-2-(fluorosulfonyl)ethoxy)-