1 BGV (3ar,4s,4ar,7ar,8r,9as)-4a,8-dimethyl-3-methylidene-2,5-dioxo-2,3,3a,4,4a,5,7a,8,9,9a-decahydroazuleno[6,5-B]furan-4-yl acetate 1.000 2 XXT [(3as,5r,5as,6s,8s,8as,9s,9ar)-9-acetyloxy-8-hydroxy-5,8a-dimethyl-1-methylidene-2-oxo-4,5,5a,6,7,8,9,9a-octahydro-3ah-azuleno[6,5-B]furan-6-yl] acetate 0.846