Using O=C1NC(=O)C(c2cn3c4c(cccc24)CCC3)=C1c1cn(CCCCO)c2ccccc12, BrC(Br)(Br)Br to produce O=C1NC(=O)C(c2cn3c4c(cccc24)CCC3)=C1c1cn(CCCCBr)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.