Using O=C([O-])COc1ccc(CCNS(=O)(=O)c2ccccc2)cc1[N+](=O)[O-] to produce Nc1cc(CCNS(=O)(=O)c2ccccc2)ccc1OCC(=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.