Using CCOC(=O)C(CC(=O)c1ccc([N+](=O)[O-])cc1)C(=O)OCC to produce O=C(O)CCC(=O)c1ccc([N+](=O)[O-])cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.