| Poly[(1,3-dihydro-1,3-dioxo-2H-isoindole-5,2-diyl)-1,6-hexanediyl(1,3-dihydro-1,3-dioxo-2H-isoindole-2,5-diyl)carbonylimino-1,4-phenyleneoxy(3,3',4,4'-tetrahydro-4,4,4',4'-tetramethyl-2,2'-spirobi[2H-1-benzopyran]-7,7'-diyl)oxy-1,4-phenyleneiminocarbonyl] |
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