Using ClC(Cl)(Br)C(Cl)(Cl)Br, CSc1nn2ccccc2c1NC(=O)OC(C)(C)C to produce CSc1nn2c(Br)cccc2c1NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.