| http://www.w3.org/ns/prov#value | - The degree of esterification or thioesterification, such as monoesterification, diesterification or triesterification, can proceed up to any level provided that the diphosphonic acid or diphosphonic acid derivatives of structural formulas I and II retains their water-solubility in the metal complexed state and in the uncomplexed state; can effectively complex with metal ions, including metal ions
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