Using OB(O)c1ccncc1, O=c1n(CCc2ccc3ncccc3n2)nc2c(Br)cccn12 to produce O=c1n(CCc2ccc3ncccc3n2)nc2c(-c3ccncc3)cccn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.