62057-57-2 Anthra(2,3-b)furo(2,3-d)furan-5,10-dione, 2,3,3a,12a-tetrahydro-4-hydroxy-6,8-dimethoxy-, cis-(-)- cis-(-)-2,3,3a,12a-Tetrahydro-4-hydroxy-6,8-dimethoxyanthra(2,3-b)furo(2,3-d)furan-5,10-dione