| Poly[[3-(4-nitrophenyl)-7,2-quinoxalinediyl]-1,4-phenyleneoxy-1,4-phenylene[3-(4-nitrophenyl)-2,7-quinoxalinediyl]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-iso |
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