Using CCOC(=O)C=Cc1cccc(OC(C)(C)C(=O)OC(C)(C)C)c1 to produce CCOC(=O)CCc1cccc(OC(C)(C)C(=O)OC(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.