Using BrC(Br)(Br)Br, Cc1ccc(Oc2ccc(Nc3ncnc4cccc(O[C@H](C)CNC(=O)[C@@H](O)CCO)c34)cc2C)cn1 to produce Cc1ccc(Oc2ccc(Nc3ncnc4cccc(O[C@H](C)CNC(=O)[C@@H](O)CCBr)c34)cc2C)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.