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