(3S)-3aβ,5,5a,9,9aβ,9bα-Hexahydro-9β-hydroxy-3,5aα,9-trimethylnaphtho[1,2-b]furan-2,6(3H,4H)-dione

(3S)-3aβ,5,5a,9,9aβ,9bα-Hexahydro-9-hydroxy-3β,5aα,9α-trimethylnaphtho[1,2-b]furan-2,6(3H,4H)-dione