Using COC(=C1C2CC3CC1CC(Cl)(C3)C2)c1cccc(OC(=O)C(C)(C)C)c1 to produce COC(=C1C2CC3CC1CC(Cl)(C3)C2)c1cccc(O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.