Using O=C(O)c1ccc(Br)cc1, CC(C)(C)OC(=O)N1CCCC1CN to produce CC(C)(C)OC(=O)N1CCCC1CNC(=O)c1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.