Using O=C(Nc1cccc2cc(CO)cnc12)c1c(Cl)cccc1Cl, BrC(Br)(Br)Br to produce O=C(Nc1cccc2cc(CBr)cnc12)c1c(Cl)cccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.