Using CCOC(=O)C(C(=O)OCC)c1c(F)cc([N+](=O)[O-])cc1F to produce O=C(O)Cc1c(F)cc([N+](=O)[O-])cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.