| http://www.w3.org/ns/prov#value | - Preferably, X is independently selected from the group consisting of groups having at least one non-carbon atom between the perfluorovinyl groups and R, such as groups containing oxygen, sulfur, selenium atoms, tellurium atoms, silicon, boron, phosphorus or nitrogen between R and the perfluorovinyl group, e.g. oxygen atoms, sulfur atoms, (thio) carboxylic ester groups, phosphines, (thio) carbonyl
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