Fingolimod Stearoate Amide-d4 is the isotope analog of Fingolimod Stearoate Amide. Fingolimod Stearoate Amide is an impurity of Fingolimod (F805000, HCl salt), a novel immune modulator that prolongs allograft transplant survival in numerous models by inhibiting lymphocyte emigration from lymphoid organs.