Using COc1cc2c(cc1C(O)c1coc(C=O)c1)C(C)(C)CCC2(C)C to produce COc1cc2c(cc1Cc1coc(C=O)c1)C(C)(C)CCC2(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.