Using CCOC(=O)C1=Cc2cc(Cl)cc(-c3ccccc3)c2OC1C(F)(F)F to produce O=C(O)C1=Cc2cc(Cl)cc(-c3ccccc3)c2OC1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.