Using Cn1c(C(F)(F)F)cc(Cl)c(-c2ccc(Cl)cc2)c1=O, [F-] to produce Cn1c(C(F)(F)F)cc(F)c(-c2ccc(Cl)cc2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.