| http://www.w3.org/ns/prov#value | - A method for the preparation of a compound of the formula CH (I IHB OH H0- 3 CHsN-CHsCHz-NCHg- R. H: (:0 0M 60 OM wherein R is a lower alkyl group and M is an alkali metal ion, which comprises refluxing the corresponding salt of dimethylol-ethylenediaminediacetate in aqueous medium with the corresponding para-alkylphenol. 3.
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