Using CC(C)(C)c1ccccc1N1CCN(C(=O)c2ccc(N3CCNC3=O)cc2)CC1, CC(C)(C)OC(=O)CBr to produce CC(C)(C)OC(=O)CN1CCN(c2ccc(C(=O)N3CCN(c4ccccc4C(C)(C)C)CC3)cc2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.