Using COc1cc(-c2nc(O)c3cc(F)ccc3n2)cc(OC)c1OC, ClCCl to produce COc1cc(-c2nc(Cl)c3cc(F)ccc3n2)cc(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.