Using CC(O)c1nn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)cc1SC(F)(F)F to produce CC(=O)c1nn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)cc1SC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.