| Poly[(phenylquinoxalinediyl)[1,1'-biphenyl]-4,4'-diyl(phenylquinoxalinediyl)oxy-1,4-phenyleneiminocarbonyl(1,3-dihydro-1,3-dioxo-2H-isoindole-5,2-diyl)-1,4-phenylenemethylene-1,4-phenylene(1,3-dihydro-1,3-dioxo-2H-isoindole-2,5-diyl)carbonylimino-1,4-phen |
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