2,3,6a,8,9,9a-Hexahydro-8,9a-dihydroxy-4-methoxycyclopenta(c)furo(3',2':4,5)furo(2,3-h)(1)benzopyran-1,11-dione 36601-31-7 Cyclopenta(c)furo(3',2':4,5)furo(2,3-h)(1)benzopyran-1,11-dione, 2,3,6a,8,9,9a-hexahydro-8,9a-dihydroxy-4-methoxy-