Using NCCO[N+](=O)[O-], O=C1NC(c2ccccc2)C(C(=O)O)O1 to produce O=C1NC(c2ccccc2)C(C(=O)NCCO[N+](=O)[O-])O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.