Using CC(C)(C)OC(=O)N1CCC(N2C(=O)C(C)(C)C(Br)c3ncc(Cl)cc32)CC1, O=C([O-])O to produce CC(C)(C)OC(=O)N1CCC(N2C(=O)C(C)(C)C(=O)c3ncc(Cl)cc32)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.