Using CCN1C(=O)C(C(=O)OC(C)(C)C)CCc2ccc(OC)cc21 to produce CCN1C(=O)C(C(=O)OC(C)(C)C)C=Cc2ccc(OC)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.