Using CCOC(=O)C(C(=O)OCC)C(=O)C1(c2ccc(F)c(Cl)c2)CCOCC1 to produce CCOC(=O)C1=C(O)c2cc(F)c(Cl)cc2C2(CCOCC2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.