Using O=[N+]([O-])c1ccc(CCBr)cc1, O=C1CNCCN1CCc1ccc([N+](=O)[O-])cc1 to produce O=C1CN(CCc2ccc([N+](=O)[O-])cc2)CCN1CCc1ccc([N+](=O)[O-])cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.