Using CCOC(=O)c1cc(=O)c2cc(C(C)(C)C)cc(C(C)(C)C)c2o1 to produce CC(C)(C)c1cc(C(C)(C)C)c2oc(C(=O)[O-])cc(=O)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.