| Poly[(1,3,3a,4,7,7a-hexahydro-1,3-dioxo-4,7-epoxy-2H-isoindole-4,2-diyl)-1,4-phenylenemethylene-1,4-phenylene(1,3,3a,4,7,7a-hexahydro-1,3-dioxo-4,7-epoxy-2H-isoindole-2,4-diyl)methylenethio-1,2-ethanediyloxycarbonylimino(methyl-1,3-phenylene)iminocarbonyl |
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