| http://www.w3.org/ns/prov#value | - nsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group and a substituted or unsubstituted heterocyclic group, and M is a hydrogen atom, an alkali metal, an ammonium or an organic ammonium.
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