Using CC(C)(C)OC(=O)N1CC(=O)OC(=O)C1, NCC(=O)c1ccc(Br)cc1 to produce CC(C)(C)OC(=O)N(CC(=O)O)CC(=O)NCC(=O)c1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.