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