The title compound, C(12)H(10)BrN(3)O(3)S, crystallizes with two crystallographically independent mol-ecules in the asymmetric unit. The dihedral angles between the two six-membered rings in the mol-ecules are 34.1 (3) and 45.1 (2)°. In the crystal structure, mol-ecules are connected via N-H⋯O and N-H⋯N hydrogen bonding.