Mycophenolate mofetil specified impurity H [EP]; Mycophenolate mofetil related compound B; 7-hydroxy-5-methoxy-4-methyl-6-(2-(tetrahydro-2-methyl-5-oxo-2-furanyl)ethyl)-1(3H)-isobenzofuranone; Mycophenolate mofetil related compound B RS [USP]; Mycophenolic acid lactone; Mycophenolate mofetil related compound B [USP]