(3aR-cis)-3a,12a-Dihydro-3a,4,6-trihydroxy-5H-furo(3',2':4,5)furo(3,2-b)xanthen-5-one 3a,12a-Dihydro-3a,4,6-trihydroxy-5H-furo(3',2':4,5)furo(3,2-b)xanthen-5-one (3aR-cis)- 55256-56-9 5H-Furo(3',2':4,5)furo(3,2-b)xanthen-5-one, 3a,12a-dihydro-3a,4,6-trihydroxy-, (3aR-cis)-