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1H-NMR spectra of Na2-EDTA, GCS and GCS-EDTA synthesized with a GCS:EDTA mass ratio of 1:30 in pOD 10 solutions at 70 °C. The numbered protons along the backbones of EDTA and GCS are shown in Figure 1. The (D) refers to deacetylated residues, while the (A) refers to acetylated residues.
