Sub Group: Chemical Impurities Catalog Number: 12041 Formula: C18H22O6 CAS Number: 31858-66-9 Molecular Weight: 334.36 Synonyms:(4E)-6-(1,3-Dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxo-5-isobenzofuranyl)-4-methyl-4-hexenoic Acid Methyl EsterMycophenolic Aci