Guaia-1(10),3-dien-12-oic acid, 6.alpha.,8.alpha.-dihydroxy-2-oxo-, 12,6-lactone, (11S)-

(3S)-4β-Hydroxy-3,3aβ,4,5,9aβ,9bα-hexahydro-3β,6,9-trimethylazuleno[4,5-b]furan-2,7-dione

(3S)-3β,6,9-Trimethyl-4β-hydroxy-3,3aβ,4,5,9aβ,9bα-hexahydroazuleno[4,5-b]furan-2,7-dione

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