Using CCOC(=O)C(C)c1ccc2oc(C(C)(C)C)cc(=O)c2c1 to produce CCOC(=O)C(C)c1ccc2c(c1)C(=O)CC(C(C)(C)C)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.