Mycophenolic Acid Methyl Ester-d6 6-(β-D-glucuronic Acid Methyl Ester) is an intermediate used in the synthesis of Mycophenolic Acid-d3 β-D-Glucuronide (M831522), which is a labelled metabolite of Mycophenolic Acid, an antibiotic produced by Penicillium brevi-compactum, P. Stoloniferum and related spp. A selective inhibitor of lymphocyte proliferation by blocking inosine monophosphate dehydrogenase, an enzyme involved in the de novo synthesis of purine nucleotides.