Using Cc1cc(Br)cnc1Br, CC(C)(C)OC(=O)N1CCCC(=O)CC1 to produce Cc1cc(Br)cnc1C1(O)CCCN(C(=O)OC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.