| Poly[[2,7-bis(1,1-dimethylethyl)-9,9-dimethyl-9H-xanthene-4,5-diyl]carbonylimino-1,4-phenyleneiminocarbonyl-1,4-phenylenecarbonylimino-1,4-phenyleneiminocarbonyl-1,4-phenylenecarbonylimino-1,4-phenyleneiminocarbonyl-1,4-phenylenecarbonylimino-1,4-phenylen |
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