Using Brc1cncc(-c2nc(-c3ccccn3)no2)c1, OB(O)c1ccccc1 to produce c1ccc(-c2cncc(-c3nc(-c4ccccn4)no3)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.