Using OB(O)c1ccncc1, O=c1n(CCc2ccc3ccccc3n2)nc2cccc(Br)n12 to produce O=c1n(CCc2ccc3ccccc3n2)nc2cccc(-c3ccncc3)n12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.