| http://www.w3.org/ns/prov#value | - nt to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3 M group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a substituted or unsubstituted
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