Using Cc1nn2ccsc2c1NC(=O)OC(C)(C)C, FC(F)(Br)C(F)(F)Br to produce Cc1nn2c(Br)csc2c1NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.