Using CCc1ccc(Br)cc1C=O, CC1(C)CC(=O)C(C)(C)O1 to produce CCc1ccc(Br)cc1C=C1C(=O)C(C)(C)OC1(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.