2,2-Bis[4-(1,1,2,2-tetrafluoroethoxy)phenyl]propane

1,1'-isopropylidenebis[4-(1,1,2,2-tetrafluoroethoxy)benzene]

1,1'-(1-Methylethylidene)bis[4-(1,1,2,2-tetrafluoroethoxy)benzene]