2,5-Bis(trifluoromethyl)-8-(fluorosulfonyl)nonafluoro-3,6-dioxaoctan-1-one

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

2,3,3,3-tetrafluoro-2-[1,1,2,3,3,3-hexafluoro-2-[1,1,2,2-tetrafluoro-2-(fluorosulphonyl)ethoxy]propoxy]propionyl fluoride