Using CON(C)C(=O)c1ccc(NC(=O)OC(C)(C)C)c(Br)c1, Clc1ccc([Mg]Br)cc1 to produce CC(C)(C)OC(=O)Nc1ccc(C(=O)c2ccc(Cl)cc2)cc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.