Using CCOC(=O)c1cc(Cl)c(-n2ccc(C(F)(F)F)cc2=O)c(Cl)c1 to produce O=C(O)c1cc(Cl)c(-n2ccc(C(F)(F)F)cc2=O)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.