Using CCOC(=O)C1=Cc2cc3c(cc2OC1C(F)(F)F)OCO3, ClCl to produce CCOC(=O)C1=Cc2c(cc3c(c2Cl)OCO3)OC1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.