Using Cc1ccncc1-c1cc(Cl)nn2c(Br)cnc12, OB(O)c1ccccc1 to produce Cc1ccncc1-c1cc(Cl)nn2c(-c3ccccc3)cnc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.