| http://www.w3.org/ns/prov#value | - wherein R4, R5 and R6 are independently selected from hydrogen, amine, halogen, alkoxide, and organic radicals having from 1 to 50 carbon atoms, provided not all of R4, R5 and R6 are hydrogen, and R7 is an organic radical having from 1 to 50 carbon atoms, preferably R7 is selected from amine, alkyl, alkenyl, and aryl groups having from 1 to 18 carbon atoms.
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