Using CCCCC12CCc3c(ccc(OCOC)c3C)C1=C(C)C(=O)C2 to produce CCCCC12CCc3c(ccc(O)c3C)C1=C(C)C(=O)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.