Alkaline earth metal complexes of the edta-type with a six-membered diamine chelate ring: crystal structures of [Mg(H2O)6][Mg(1,3-pdta)] · 2H2O and [Ca(H2O)3Ca(1,3-pdta)(H2O)] · 2H2O: comparative stereochemistry of edta-type complexes - ScienceDirect
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EDTA – PO CO W KOSMETYKACH CHELATORY – ilenatury.pl