Using BrBr, Cn1cncc1-c1ccnc(Nc2ccc(S(N)(=O)=O)cc2)n1 to produce Cn1cncc1-c1nc(Nc2ccc(S(N)(=O)=O)cc2)ncc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.