perfluoro(8-cyano-5-methyl-3,6-dioxa-1-octene), 3-(1-{difluoro[(trifluorovinyl)oxy]methyl}-1,2,2,2-tetrafluoroethoxy)-2,2,3,3-tetrafluoropropiononitrile, 2,2,3,3-tetrafluoro-3-({1,1,1,2,3,3-hexafluoro-3-[(trifluoroethenyl)oxy]propan-2-yl}oxy)propanenitrile
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