Using COB(OC)OC, Brc1cc(-c2cccc3c2[nH]c2ccccc23)cc(-c2cccc3c2[nH]c2ccccc23)c1 to produce OB(O)c1cc(-c2cccc3c2[nH]c2ccccc23)cc(-c2cccc3c2[nH]c2ccccc23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.