| Poly[(3,3a,7,7a-tetrahydro-1,3-dioxo-4,7-epoxy-1H-isoindole-4,2-diyl)[1,1'-biphenyl]-4,4'-diyl(3,3a,7,7a-tetrahydro-1,3-dioxo-4,7-epoxy-1H-isoindole-2,4-diyl)methylenethio-1,2-ethanediyloxycarbonylimino(methyl-1,3-phenylene)iminocarbonyloxy-1,2-ethanediyl |
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