Using Cc1nnc(Cl)c(-c2c(F)cc(N)cc2F)c1-c1ccc(Cl)cc1, Cl to produce Cc1nnc(Cl)c(-c2c(F)cc(Cl)cc2F)c1-c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.