Crystal structure of diaquabis{4-[(2-pyridylmethylidene)-amino]benzenesulfonato-k2N,N′]copper(II) dihydrate, Cu(C12H9N2O3S)2(H2O)2 · 2H2O - Yin Xiu-Ju (Zeitschrift für Kristallographie - New Crystal Structures, 2012)