Using OB(O)c1ccc(Cl)cc1Cl, COC(=O)c1cc2nccn2cc1Br to produce COC(=O)c1cc2nccn2cc1-c1ccc(Cl)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.