| http://www.w3.org/ns/prov#value | - ining 2 to 8 carbon atoms, a straight chain alkyl group containing 2 to 8 carbon atoms,benzyl, diazine, triazine, quinoxaline and quinazoline;with the proviso that when R is an alkyl group, the anionic group may be directly attached to R or may be attached through a bridging aromatic or benzyl group,with the further proviso that R or aromatic groups connected to R may have additional substituents
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