Using CC(C)(C)OC(=O)CBr, CNC(=O)c1ccc(NC(=O)OC(C)(C)C)cc1 to produce CNC(=O)c1ccc(N(CC(=O)OC(C)(C)C)C(=O)OC(C)(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.