Using COB(OC)OC, O=c1c(Br)cn(-c2cccc(-c3ccccc3)c2)cc1OCc1ccccc1 to produce COB(OC)c1cn(-c2cccc(-c3ccccc3)c2)cc(OCc2ccccc2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.