Using BrBr, Cn1c(C(F)(F)F)cc(=O)n(-c2ccc3snc(CS(=O)(=O)c4ccccc4)c3c2)c1=O to produce Cn1c(C(F)(F)F)cc(=O)n(-c2ccc3snc(C(Br)S(=O)(=O)c4ccccc4)c3c2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.