5,7-Dihydroxy-4-methylphthalide

5,7-dihydroxy-4-methyl-3H-2-benzofuran-1-one

5,7-Dihydroxy-4-methyl-1(3H)-isobenzofuranone

4-Methyl-5,7-dihydroxyisobenzofuran-1(3H)-one

4-Methyl-5,7-dihydroxy-1,3-dihydroisobenzofuran-1-one