Using OB(O)c1cccnc1, CN1C(=O)Cc2c1ccc(-c1cncc(Br)c1)c2Cl to produce CN1C(=O)Cc2cc(-c3cncc(-c4cccnc4)c3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.