Using CC(C)(C)OC(=O)c1csnc1-c1ccc(Cl)cc1, BrBr to produce CC(C)(C)OC(=O)c1c(-c2ccc(Cl)cc2)nsc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.