2,2-Bis(4-carboxyphenyl)hexafluoropropane4,4′-(Hexafluoroisopropylidene)bis(benzoic acid)2,2-双(4-羧基苯基)六氟丙烷2,2-Bis(4-carboxyphenyl)hexafluoropropane4,4'-Hexafluoroisopropylidenebis(benzoic acid)4,4'-(1,1,1,3,3,3-Hexafluoropropane-2,2-diyl)dibenzoic acid2,2-Bis(4-carboxyphenyl)hexafluoropropane 98%4,4'-(Perfluoropropane-2,2-diyl)dibenzoic acid