Using CC(C)(C)OC(=O)CC(=O)[O-], O=C1OC(=O)c2ccccc21 to produce CC(C)(C)OC(=O)/C=C1\OC(=O)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.