| http://www.w3.org/ns/prov#value | - r of about 2 to 30; R1 is a residue of a hydroxy-containing ethylenically unsaturated compound; R2 is hydrogen or a residue of a hydroxy-containing ethylenicalty unsaturated compound different from R1 or another metal group M; R3 is a residue of a hydroxy-containing ethylenically unsaturated compound; w is a number of moieties having residues R required for metal valence n; x is an integer of abou
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