Using CCOC(=O)C1(c2ccc(Cl)cc2)OCC(c2ccc(F)cc2)(c2ccc(F)cc2)CO1 to produce O=C(O)C1(c2ccc(Cl)cc2)OCC(c2ccc(F)cc2)(c2ccc(F)cc2)CO1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.