Propanoyl fluoride,2,3,3,3-tetrafluoro-2-(1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-tetrafluoro-2-(fluorosulfonyl)ethoxy)propoxy), 2,3,3,3-tetrafluoro-2-{1,1,2,3,3,3-hexafluoro-2-[1,1,2,2-tetrafluoro-2-(fluorosulfonyl)ethoxy]propoxy}propanoyl fluoride, 8-fluorosulfonyl-2,5-bis(trifluoromethyl)octafluoro-3,6-dioxaoctanoyl fluoride, EINECS 223-824-4, 2,3,3,3-tetrafluoro-2-{1,1,2,3,3,3-hexafluoro-2-[1,1,2,2-tetrafluoro-2-(fluorosulfonyl)ethoxy]propoxy}propionyl fluoride,