Using COC(=O)CC1CCN(c2ccc(Cl)cc2)C(c2ccc(C(F)(F)F)cc2)C1 to produce O=C(O)CC1CCN(c2ccc(Cl)cc2)C(c2ccc(C(F)(F)F)cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.