Using BrC(Br)(Br)Br, CC(=O)Nc1nc(CCc2ccc(CCO)cc2)cs1 to produce CC(=O)Nc1nc(CCc2ccc(CCBr)cc2)cs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.