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