Using O=C([O-])C(F)(F)Cl, CCOC(=O)n1nc(O)c2cc([N+](=O)[O-])ccc21 to produce CCOC(=O)n1nc(OC(F)F)c2cc([N+](=O)[O-])ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.