| Poly[(1,1',3,3'-tetrahydro-1,1',3,3'-tetraoxo[5,5'-bi-2H-isoindole]-2,2'-diyl)[3'-(trifluoromethyl)[1,1'-biphenyl]-2,4-diyl]oxy(2,2',3,3'-tetrahydro-3,3,3',3'-tetramethyl-1,1'-spirobi[1H-indene]-6,6'-diyl)oxy[3'-(trifluoromethyl)[1,1'-biphenyl]-4,2-diyl]] |
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