Mycophenolate Mofetil-d4 is the deuterium labeled Mycophenolate Mofetil. Mycophenolate mofetil (RS 61443) is the morpholinoethylester proagent of Mycophenolic acid. Mycophenolate mofetil inhibits de novo purine synthesis via the inhibition of inosine monophosphate dehydrogenase (IMPDH). Mycophenolate mofetil shows selective lymphocyte antiproliferative effects involve both T and B cells, preventing antibody formation[1].