Using O=C([O-])[O-], C=CCc1c(O)c(C)cc2c(=O)c3ccccc3oc12 to produce Cc1cc2c(=O)c3ccccc3oc2c2c1OC(C(=O)O)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.