Using O=C(CCC(=O)c1ccc([N+](=O)[O-])cc1)c1ccc(Br)cc1 to produce O=[N+]([O-])c1ccc(C(O)CCC(O)c2ccc(Br)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.