Using CC(C)(C)c1cc(C(Br)c2cc(C(C)(C)C)cc(C(C)(C)C)c2O)c(O)c(C(C)(C)C)c1 to produce CC(C)(C)C1=CC(=Cc2cc(C(C)(C)C)cc(C(C)(C)C)c2O)C(=O)C(C(C)(C)C)=C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.