Using CCOC(=O)c1[nH]c2ccc(Cl)cc2c1-c1ccccc1, BrBr to produce CCOC(=O)c1[nH]c2cc(Br)c(Cl)cc2c1-c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.