Using CCOC(=O)C(Cl)C(=O)C(C)C, O=C(O)c1ccc(C(F)(F)F)cc1 to produce CCOC(=O)C(OC(=O)c1ccc(C(F)(F)F)cc1)C(=O)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.