Using OB(O)c1cccc(-n2cccn2)c1, Clc1ccn2c(Br)cnc2c1 to produce Clc1ccn2c(-c3cccc(-n4cccn4)c3)cnc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.