Using CON(C)C(=O)CNC(=O)OC(C)(C)C, Cn1c(=O)c(Br)cc2ccccc21 to produce Cn1c(=O)c(C(=O)CNC(=O)OC(C)(C)C)cc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.