Using BrC(Br)(Br)Br, COc1cc(Nc2c(C#N)cnc3sc(CCCCO)cc23)cc(OC)c1OC to produce COc1cc(Nc2c(C#N)cnc3sc(CCCCBr)cc23)cc(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.