Using CN(C(=O)OC(C)(C)C)C1CCN(S(=O)(=O)c2cccc3cncc(Br)c23)C1 to produce CNC1CCN(S(=O)(=O)c2cccc3cncc(Br)c23)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.