Using CCOC(=O)C(C)C, CC(=O)c1ccc(F)c2ccc(F)cc12 to produce CC(C)C(=O)CC(=O)c1ccc(F)c2ccc(F)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.