Using SCCS, CSc1c(C(C)=O)nn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)c1N to produce CSc1c(C2(C)SCCS2)nn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)c1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.