Using CCOC(=O)C(C(=O)OCC)C1(C)CCc2c(C)c(OC)c(C)c(C)c2O1 to produce COc1c(C)c(C)c2c(c1C)CCC(C)(CC(=O)O)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.