Using CNC(=O)c1cc(CSc2nc(N)c(C#N)c(-c3ccc(F)c(F)c3)c2C#N)ccn1, Cl to produce CNC(=O)c1cc(CSc2nc(Cl)c(C#N)c(-c3ccc(F)c(F)c3)c2C#N)ccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.