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