Using CC1(C)OC(C)(C)C(=O)C(c2cc(Br)ccc2Cl)C1=O, OB(O)c1ccc(Cl)cc1 to produce CC1(C)OC(C)(C)C(=O)C(c2cc(-c3ccc(Cl)cc3)ccc2Cl)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.