Using O=C1CCC(=O)N1Br, O=C(OCc1ccc([N+](=O)[O-])cc1)N1CCC(=CCO)CC1 to produce O=C(OCc1ccc([N+](=O)[O-])cc1)N1CCC(=CCBr)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.