Using COC(=O)c1ccc2c([N+](=O)[O-])cc3c(c2c1)C(CCl)CN3C(=O)C(F)(F)F to produce O=C(O)c1ccc2c([N+](=O)[O-])cc3c(c2c1)C(CCl)CN3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.