Using Cc1c(C)c2c(c(C)c1O)CCC(C)(CC(=O)O)O2, O=C([O-])O to produce COC(=O)CC1(C)CCc2c(C)c(O)c(C)c(C)c2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.