Seol an Taifead seo mar Ríomhphost: Crystal structure of diaqua-bis(pyridine-2,6-dicarboxylato-O,N,O′)-(μ2- pyrazino)dicopper(II) dihydrate, [Cu2(C4H4N2)(C7H3NO4)2(H2O)2] · 2H2O