Using O=C(O)c1ccc(CCc2ccccc2)cc1Nc1ccccc1[N+](=O)[O-] to produce Nc1ccccc1Nc1cc(CCc2ccccc2)ccc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.