Using NS(=O)(=O)c1ccc(Br)s1, O=C(O)c1ccc(Br)cc1Cl to produce O=C(NS(=O)(=O)c1ccc(Br)s1)c1ccc(Br)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.