Using Cc1cc2c(cc1Br)C(=O)C1(CCC(O)CC1)C2, CC(C)(C)[O-] to produce COC1CCC2(CC1)Cc1cc(C)c(Br)cc1C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.