| http://www.w3.org/ns/prov#value | - R1???((PO3)M2)x where: M is selected from the group consisting of hydrogen, an alkaline metal, alkyl, alkenyl, alkynyl, alkoxy, aryl, cyclic, heteroaryl, and heterocyclic; R1 is selected from the group consisting of amino, aminoalkyl, and hydroxyalkyl; and x is a number equal to the valence of R1, provided that x is 1 or higher.
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