| Poly[(3-phenyl-7,2-quinoxalinediyl)-1,4-phenyleneiminocarbonyl-1,4-phenylenecarbonylimino-1,4-phenylene(3-phenyl-2,7-quinoxalinediyl)oxy-1,4-phenyleneiminocarbonyl(1,3-dihydro-1,3-dioxo-2H-isoindole-5,2-diyl)-1,4-phenylenesulfonyl-1,4-phenylene(1,3-dihydr |
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