Using CC1(C)OC(=O)CC(=O)O1, O=C(Cl)Cc1ccc(F)cc1 to produce CC1(C)OC(=O)C(C(=O)Cc2ccc(F)cc2)C(=O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.