Using CC(C)(C)OC(=O)N1CCN(C(=O)N2CCN(S(=O)(=O)c3ccc(Br)cc3)CC2)CC1 to produce O=C(N1CCNCC1)N1CCN(S(=O)(=O)c2ccc(Br)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.