Using CN1CCN(C(=O)c2cn(S(=O)(=O)c3ccccc3Br)c3ccccc23)CC1 to produce CN1CCN(Cc2cn(S(=O)(=O)c3ccccc3Br)c3ccccc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.