Using CCOC(=O)CCC1OC(=O)C(O)=C1c1ccccc1, O=C([O-])[O-] to produce CCOC(=O)CCC1OC(=O)C(OC)=C1c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.