(2R)-1,2,12,12aα-Tetrahydro-6aα-hydroxy-2α-isopropenyl-8,9-dimethoxy-[1]benzopyrano[3,4-b]furo[2,3-h][1]benzopyran-6(6aH)-one

(2R)-2α-(1-Methylvinyl)-6aα-hydroxy-8,9-dimethoxy-1,2,6,6a,12,12aα-hexahydro[1]benzopyrano[3,4-b]furo[2,3-h][1]benzopyran-6-one

(1)Benzopyrano(3,4-B)furo(2,3-H)(1)benzopyran-6(6ah)-one, 1,2,12,12A-alpha-tetrahydro-6A-alpha-hydroxy-2-alpha-isopropenyl-8,9-dimethoxy-