| http://www.w3.org/ns/prov#value | - R17 is alkyl (preferably of from 1 to 12 carbon atoms, e.g. methyl, isopropyl, n-hexyl, octyl, t-butyl, etc.) or an aromatic group (preferably of from 6 to 20 carbon atoms, e.g. phenyl, ethylenephenyl, xylyl, naphthyl, etc.), and M is a monovalent cation such as hydrogen, an alkali metal or an ammonium cation.
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