Using COC(=O)/C(=C\c1ccc(-c2ccccc2)cc1)CC(=O)OC(C)(C)C to produce COC(=O)C(CC(=O)OC(C)(C)C)Cc1ccc(-c2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.