Using CBr, CCOCC(=O)Nc1c(S(=O)C(F)(F)F)c(C#N)nn1-c1c(Cl)cc(C(F)(F)F)cc1Cl to produce CCOCC(=O)N(C)c1c(S(=O)C(F)(F)F)c(C#N)nn1-c1c(Cl)cc(C(F)(F)F)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.