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1H NMR spectra (400 MHz, room temperature, H2O + 10% D2O) of the in situ generated cuprous complexes: (A) DO4S (CCu= CDO4S = 1.6 × 10–3 mol/L) and (B) DO2A2S (CCu = CDO2A2S = 1.4 × 10–3 mol/L) at pH 7. The signal marked with an asterisk (2.22 ppm) is related to the acetone impurity.
