Using CCOC(=O)c1cc(Nc2c(F)cc(F)cc2Cl)c(Cl)cc1Cl to produce O=C(O)c1cc(Nc2c(F)cc(F)cc2Cl)c(Cl)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.