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Preferred hydroxyalkylidene diphosphonic acids (or salts thereof) can be represented by the following Structure III: wherein R9 is a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms (methyl, methoxymethyl, ethyl, isopropyl, n-butyl, t-butyl and n-pentyl) and M is hydrogen or a monovalent cation (such as ammonium or alkali metal ions).
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