Superoxide dismutase activity of ternary copper complexes of sulfathiazole and imidazole derivatives.: Synthesis and properties of [CuL2(R-Him)2] [HL=4-amino-N-(thiazol-2-yl)benzenesulfonamide, R-Him=4-methylimidazole, 4,4-dimethylimidazoline or 1,2-dimethylimidazole].: Crystal structure of [CuL2(4,4-dimethylimidazoline)2]