XXT 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 XXT