Using O=C(O)CCC(CCC(=O)O)(CCC(=O)O)[N+](=O)[O-], BrCc1ccccc1 to produce O=C(CCC(CCC(=O)OCc1ccccc1)(CCC(=O)OCc1ccccc1)[N+](=O)[O-])OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.