Using COB(OC)c1cn(-c2cccc(-c3ccccc3)c2)cc(OCc2ccccc2)c1=O to produce O=c1c(O)cn(-c2cccc(-c3ccccc3)c2)cc1B(O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.