Using O=C(O)C(Oc1ccc(C(F)(F)F)cc1)c1cccc(C(F)(F)F)c1 to produce O=C([O-])C(Oc1ccc(C(F)(F)F)cc1)c1cccc(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.