| http://www.w3.org/ns/prov#value | - aryl, preferably having from 6 to 12 carbon atoms, such as phenyl, naphthyl, tolyl, and the like; or substituted or unsubstituted alkyl, preferably having from 1 to 7 carbon atoms, such as methyl, ethyl, propyl, methylphenyl, and the like; and M is a solubilizing cation and preferably a monovalent cation such as an alkali metal, ammonium cation or hydrogen.
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