Using O=C1OC(=O)C(C2CCOCC2)=C1C1CCOCC1, [OH-] to produce O=C([O-])/C(=C(\C(=O)[O-])C1CCOCC1)C1CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.