Using OB(O)c1cccnc1, CN1C(=O)Cc2cc(-c3cncc(Br)c3)ccc21 to produce CN1C(=O)Cc2cc(-c3cncc(-c4cccnc4)c3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.