Using O=C(Nc1ccc([N+](=O)[O-])cc1)Nc1ccc([N+](=O)[O-])cc1, CCOC(=O)CC(=O)OCC to produce O=C1CC(=O)N(c2ccc([N+](=O)[O-])cc2)C(=O)N1c1ccc([N+](=O)[O-])cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.