| http://www.w3.org/ns/prov#value | - wherein R, R.sup.I, R.sup.II, and R.sup.III, independently represent an aryl or alkyl group which may be substituted or unsubstituted, M.sup.II is a divalent metal ion, M.sup.III is a trivalent metal ion, E is any one of an oxide ion, a selenide
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