1,3,3,4,4-pentafluoro-2-(1,2,2,2-tetrafluoroethyl)cyclobutene

1,1,2,2,3,3-hexafluoro-4-(2,2,2-trifluoroethylidene)cyclobutane

1,3,3,4,4-pentafluoro-2-(1,1,2,2,2-pentafluoroethyl)cyclobutene

2,2,3,4-tetrafluorobut-3-enoic acid

1,1,2,2-tetrakis(trifluoromethyl)hydrazine