| http://www.w3.org/ns/prov#value | - wherein A is a hydrocarbon or heterocyclic compound residue which may be substituted or not, R' is a hydrogen atom or a substituted or unsubstituted hydrocarbon group and n is an integer of not less than 1, provided that at least one R' is a hydrogen atom except the case that A bears two or more phenolic hydroxyl groups.
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