(6aR)-6aα,11aα-Dihydro-10-(3-methyl-2-butenyl)-6H-benzofuro[3,2-c][1]benzopyran-3,9-diol

6H-Benzofuro[3,2-c][1]benzopyran-3,9-diol,6a,11a-dihydro-10-(3-Methyl-2-buten-1-yl)-, (6aR,11aR)-