| Poly[(1,3,3a,4,7,7a-hexahydro-1,3-dioxo-4,7-epoxy-2H-isoindole-2,4-diyl)methyleneoxycarbonylimino-1,6-hexanediyliminocarbonyloxymethylene(1,3,3a,4,7,7a-hexahydro-1,3-dioxo-4,7-epoxy-2H-isoindole-4,2-diyl)-1,4-phenylenecarbonyloxy-1,3-phenyleneoxycarbonyl- |
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