Chasmanthin

(2R,4aβ,7aα,8aα,9aα)-Dodecahydro-2α-(3-furyl)-7α-hydroxy-6aα,9bβ-dimethyl-9β,7-(epoxymethano)-4H-oxireno[6,7]naphtho[2,1-c]pyran-4,11-dione