1H,5H,12H-Furo[3,4-b:2,3-h']bis[1]benzopyran-1,5-dione,4,4a,13,14-tetrahydro-4a,6,8,13-tetrahydroxy-4,12-bis(4-hydroxyphenyl)-, [4R-(4a,4aa,10aR*,12a,13b)]-