Using BrCc1ccccc1, NS(=O)(=O)c1cc(C(=O)O)cc(S)c1Cl to produce NS(=O)(=O)c1cc(C(=O)O)cc(SCc2ccccc2)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.