| http://www.w3.org/ns/prov#value | - More preferably, X is independently selected from the group consisting of groups having at least one noncarbon 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) carbo
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