Using O=C([O-])[O-], Cc1c(C(=O)OC(C)(C)C)oc2cccc(O)c12 to produce COc1cccc2oc(C(=O)OC(C)(C)C)c(C)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.