1H-2-Benzopyran-1-one, 3,4-dihydro-4,8-dihydroxy-3-methyl- 3-Methyl-4,8-dihydroxy-3,4-dihydroisocoumarin 33788-22-6 Isocoumarin, 3,4-dihydro-4,8-dihydroxy-3-methyl-