Using CCCC(=O)C(=O)OCC, NNc1ccc([N+](=O)[O-])cc1 to produce CCCC(=O)C(=NNc1ccc([N+](=O)[O-])cc1)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.