Using CC(C)(C)OC(=O)N1CCc2c(O)nc(C(F)(F)F)nc2C1, ClC(Cl)(Cl)Cl to produce CC(C)(C)OC(=O)N1CCc2c(Cl)nc(C(F)(F)F)nc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.