Using COC(=O)/C(=C\c1ccc(Cl)c(Cl)c1)C(=O)c1ccc(Br)s1 to produce COC(=O)C1C(=O)c2sc(Br)cc2C1c1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.