Using OB(O)c1ccncc1, COC(=O)c1c(-c2ccccc2)[nH]c(Br)c1C to produce COC(=O)c1c(-c2ccccc2)[nH]c(-c2ccncc2)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.