Using BrC(Br)(Br)Br, Cc1ccc(-c2c(CO)c(C)nc3sc4c(c23)CCCC4)cc1 to produce Cc1ccc(-c2c(CBr)c(C)nc3sc4c(c23)CCCC4)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.