| http://www.w3.org/ns/prov#value | - wherein R3 represents one or more inertly substituted groups as defined above for R1, X independently is a group which links the inertly substituted groups and the trifluorovinyl group and has the aforestated meanings and z is from 2 to about 1000, preferably from 2 to about 100, more preferably from 2 to about 10 and most preferably from 2 to about 5.
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