Using OC[C@@]1(O)CCSc2c(OC(F)F)cc(Cl)cc21, O=C([O-])[O-] to produce O=C(O)[C@@]1(O)CCSc2c(OC(F)F)cc(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.