Using OO, CCc1cc(Br)ccc1C=C1C(=O)C(C)(CC)OC1(C)CC to produce CCc1cc(Br)ccc1C1OC12C(=O)C(C)(CC)OC2(C)CC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.