Using CCOC(=O)C(Cc1cccc(OC(F)(F)C(F)F)c1)C(=O)c1ccc(Cl)nc1 to produce CCOC(=O)C(Cc1cccc(OC(F)(F)C(F)F)c1)C(O)c1ccc(Cl)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.