| http://www.w3.org/ns/prov#value | - R--N(CH2 PO3 M2)2 wherein M is a hydrogen atom or a monovalent cation and R is an alkyl group, an aryl group, an aralkyl group, an alkaryl group, an alicyclic group or a heterocyclic radical, and R can be further substituted with substituents such as hydroxyl, halogen, an alkoxy group, a --PO3 M2 group, a --CH2 PO3 M2 group, or an --N(CH2 PO3 M2)2 group;
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