| Poly[(4,6,7-trifluoro-1,3-dihydro-1,3-dioxo-2H-isoindole-2,5-diyl)oxy(2,3,5,6-tetrafluoro-1,4-phenylene)oxy(4,6,7-trifluoro-1,3-dihydro-1,3-dioxo-2H-isoindole-5,2-diyl)[2-(trifluoromethyl)-1,4-phenylene]oxy[1,1'-biphenyl]-4,4'-diyloxy[3-(trifluoromethyl)- |
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