| Poly[(1,3-dihydro-1,3-dioxo-2H-isoindole-2,5-diyl)oxy(3,3',4,4'-tetrahydro-4,4,4',4',7,7'-hexamethyl-2,2'-spirobi[2H-1-benzopyran]-6,6'-diyl)oxy(1,3-dihydro-1,3-dioxo-2H-isoindole-5,2-diyl)-1,4-phenyleneoxy-1,4-phenylenesulfonyl-1,4-phenyleneoxy-1,4-pheny |
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