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