Using CCOC(=O)CCCCCOc1c(CO)oc(COC(=O)C(C)(C)C)cc1=O to produce CCOC(=O)CCCCCOc1c(C=O)oc(COC(=O)C(C)(C)C)cc1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.