| Poly[(1,3-dihydro-1,3-dioxo-2H-isoindole-5,2-diyl)[3-(trifluoromethyl)-1,4-phenylene]oxy-1,4-phenyleneoxy[2-(trifluoromethyl)-1,4-phenylene](1,3-dihydro-1,3-dioxo-2H-isoindole-2,5-diyl)carbonylimino[3-(trifluoromethyl)-1,4-phenylene]oxy-1,4-phenyleneoxy[2 |
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