Using Brc1ccc2cc(OCc3ccccc3)c(C34CC5CC(CC(C5)C3)C4)cc2c1, COB(OC)OC to produce OB(O)c1ccc2cc(OCc3ccccc3)c(C34CC5CC(CC(C5)C3)C4)cc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.