Using BrC(Br)(Br)Br, O=C1NC(=O)C(c2cn3c4c(cccc24)CC(CO)C3)=C1c1c[nH]c2cc(F)ccc12 to produce O=C1NC(=O)C(c2cn3c4c(cccc24)CC(CBr)C3)=C1c1c[nH]c2cc(F)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.