| http://www.w3.org/ns/prov#value | - wherein Rf is a non-hydrolyzable substituent having 1 to 30 fluorine atoms bonded to carbon atoms, R is a non-hydrolyzable substituent, X is a hydrolyzable substituent, and b is an integer from 0 to 2, preferably 0 or 1 and in particular 0.
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