Using OB(O)c1ccccc1, Clc1ccc(-c2cc3cc(Br)ccc3[nH]2)cc1 to produce Clc1ccc(-c2cc3cc(-c4ccccc4)ccc3[nH]2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.