Using Cn1c(=O)c(Cc2ccc(-c3ccc(F)c(Cl)c3)cc2)c(O)c2ccccc21, COC(=O)C(F)(F)Cl to produce Cn1c(=O)c(Cc2ccc(-c3ccc(F)c(Cl)c3)cc2)c(OC(F)F)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.