Using O=C(OC(=O)C(F)(F)F)C(F)(F)F, NC(=O)C1CCN(c2c(Cl)cncc2Cl)CC1 to produce NC(=O)C1CCN(c2c(Cl)c[n+]([O-])cc2Cl)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.