Using CC(=O)OC(C)=O, Cc1ccc(C(=O)CCC(=O)O)cc1[N+](=O)[O-] to produce CC(=O)Nc1cc(C(=O)CCC(=O)O)ccc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.