Using O=C([O-])[O-], Fc1cnccc1-c1nc2cc(C(F)(F)F)c(Cl)cc2o1 to produce COc1cnccc1-c1nc2cc(C(F)(F)F)c(Cl)cc2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.