3aβ,5,6,6aβ,7,9bα-Hexahydro-6β-hydroxy-3β,6,9-trimethylazuleno[4,5-b]furan-2,8(3H,4H)-dione

(3S)-3aβ,4,5,6,6aβ,9bα-Hexahydro-3,6,9-trimethyl-6β-hydroxyazuleno[4,5-b]furan-2,8(3H,7H)-dione

(3S,3aβ,6aβ,9bα)-3a,5,6,6a,7,9b-Hexahydro-6β-hydroxy-3β,6,9-trimethylazuleno[4,5-b]furan-2,8(3H,4H)-dione

(αS,4S)-α,3,8α-Trimethyl-2-oxo-4β,8-dihydroxy-1,2,4,5,6,7,8,8aβ-octahydroazulene-5α-acetic acid 5,4-lactone