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![Poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxole-co-tetrafluoroethylene]](https://www.sigmaaldrich.com/content/dam/sigma-aldrich/structure0/155/mfcd00803821.eps/_jcr_content/renditions/mfcd00803821-large.png)