Using O=C([O-])[O-], O=c1cc(Br)c2cc(C(c3ccc(Cl)cc3)c3nccs3)ccc2[nH]1 to produce Cn1c(=O)cc(Br)c2cc(C(c3ccc(Cl)cc3)c3nccs3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.