Diosbulbin A

(2R)-2-(3-Furyl)-1,2,6,6aβ,7,8,9,10,10aα,10b-decahydro-9α-hydroxy-10bβ-methyl-4-oxo-4H-3aβ,6β-methanofuro[2,3-d][2]benzoxepine-7α-carboxylic acid methyl ester