Using O=C(O)c1ccc(Br)cc1, O=c1n(-c2cc(Cl)cc(Cl)c2)c(=O)n2n1CC(O)C2 to produce O=C(OC1Cn2c(=O)n(-c3cc(Cl)cc(Cl)c3)c(=O)n2C1)c1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.