Using COB(OC)OC, Brc1ccc(-c2ccc3c(c2)c2ccccc2n3-c2ccccc2)cc1 to produce OB(O)c1ccc(-c2ccc3c(c2)c2ccccc2n3-c2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.