Using OB(O)c1cccnc1, O=C(Nc1ccccc1)c1cn2cc(Br)ccc2n1 to produce O=C(Nc1ccccc1)c1cn2cc(-c3cccnc3)ccc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.