Using O=C1CCC(NC(=O)OCc2ccccc2)(C(=O)O)O1, O=[N+]([O-])c1ccc(CBr)cc1 to produce O=C1CCC(NC(=O)OCc2ccccc2)(C(=O)OCc2ccc([N+](=O)[O-])cc2)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.