Using CCOC(=O)c1nc(C)c(Br)s1, OB(O)c1cccc2ccccc12 to produce CCOC(=O)c1nc(C)c(-c2cccc3ccccc23)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.