| http://www.w3.org/ns/prov#value | - of the other, are alkylene, arylene, arylalkylene, or alkylarylene groups, R2 and R???2 each, independently of the other, are alkyl, aryl, arylalkyl, or alkylaryl groups, R3 and R???3 each, independently of the other, are hydrogen atoms or alkyl groups, R4 and R???4 each, independently of the other, are hydrogen atoms, fluorine atoms, alkyl groups, or phenyl groups, n is an integer of 0, 1, 2, 3,
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