Using OB(O)c1cccc(O)c1, Cn1c(=O)n(CC(C)(C)C)c2ccc(Br)cc21 to produce Cn1c(=O)n(CC(C)(C)C)c2ccc(-c3cccc(O)c3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.