Using OB(O)c1ccc2ccccc2c1, Brc1c2ccccc2c(Br)c2ccccc12 to produce Brc1c2ccccc2c(-c2ccc3ccccc3c2)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.