Using Cn1nc(-c2c(Cl)cccc2Cl)nc1-c1sc(Cl)c(Cl)c1Cl, BrBr to produce Cn1nc(-c2c(Cl)cccc2Cl)nc1-c1sc(Br)c(Cl)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.