Using CCOC(=O)CCc1c(C(=O)OCC)[nH]c2cc(Br)cc(Br)c12, OB(O)c1ccccc1 to produce CCOC(=O)CCc1c(C(=O)OCC)[nH]c2cc(-c3ccccc3)cc(-c3ccccc3)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.