The title compound was prepared by the reaction of CuSO4·5H2O (1.25 g, 5 mmol) in H2O (100 ml) and nicotinamide (1.22 g, 10 mmol) in water (25 ml) with sodium 4-sulfamoylbenzoate (2.23 g, 10 mmol) in water (150 ml) at room temperature. The mixture was filtered and set aside for several days at ambient temperature to crystallize, giving blue single crystals (yield: 2.11 g, 29%). Combustion analysis: found; C, 42.85; H, 3.70; N, 11.68; S, 8.70%. Calculated: C26H26CuN6O11S2 C, 42.96; H, 3.58; N, 11.57; S, 8.81%. FT–IR: 3363, 3163, 1692, 1677, 1602, 1519, 1432, 1380, 1340, 1301, 1162, 1138, 1093, 1058, 778, 730, 688, 615, 532, 479, 427 cm−1.