Using CCOC(=O)C(=O)OCC, CC(=O)/C=C/c1ccc(Cl)cc1F to produce CCOC(=O)C(=O)CC(=O)/C=C/c1ccc(Cl)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.