Mycophenolic Acid O-Desmethyl Methyl Ester 

Chemical Name: O-Desmethyl Mycophenolic Acid Methyl Ester ;  Methyl (4E)-6-(1,3-dihydro-4,6-dihydroxy-7-methyl-3-oxo-5-isobenzofuranyl)-4-methyl-4-hexenoate ;