Using COC(=O)c1c(F)c(F)c(F)c(F)c1C(=O)O, O=C([O-])[O-] to produce COC(=O)c1c(F)c(F)c(OC)c(F)c1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.