Using CCOC(=O)COC1CCC2(CO2)C(C2(C)OC2CC=C(C)C)C1OC to produce COC1C(OCC(=O)O)CCC2(CO2)C1C1(C)OC1CC=C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.