Using CCOC(=O)C(Cc1ccc([N+](=O)[O-])cc1)C(=O)CCc1ccc([N+](=O)[O-])cc1 to produce O=C(CCc1ccc([N+](=O)[O-])cc1)CCc1ccc([N+](=O)[O-])cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.