Using COC(=O)c1ncc(OCC(F)(F)F)c(-c2ccc(Cl)cc2)n1 to produce O=C(O)c1ncc(OCC(F)(F)F)c(-c2ccc(Cl)cc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.