Using CC1(COC(F)(F)C(F)(F)CC(F)(F)F)COC1, [OH-] to produce FC(F)(F)CC(F)(F)C(F)(F)OCC1(COC(F)(F)C(F)(F)CC(F)(F)F)COC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.