Mycophenolate Mofetil-d 4 hydrochloride is deuterated labeled Mycophenolate mofetil hydrochloride. Mycophenolate mofetil (RS 61443) hydrochloride is a immunosuppressant, a non-competitive, selective and reversible inhibitor of inosine monophosphate dehydrogenase (IMPD) type I/II with IC 50 s of 39 nM and 27 nM, respectively.