| http://www.w3.org/ns/prov#value | - Examples of such preferred sodium salts of EDDS include Na2EDDS and Na3EDDS. [0051] The structure of the acid form of EDDS is as follows: [0052] EDDS can be synthesised, for example, from readily available, inexpensive starting materials such as maleic anhydride and ethylenediamine.
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