Tubingensin B, a cytotoxic carbazole alkaloid from the sclerotia of Aspergillus tubingensis

The crystal structure of tubingensin B, (1α,4α,4aα,7α,14bβ)-(−)-2,3,4,4a,5,6,7,9-octahydro-4,4a-dimethyl-7-(2-propyl)-1H-7,14b-ethano­benzo[c]cyclo­hepta­[1,2-b]carbazol-1-ol, C28H35NO·0.5CHCl3, confirms the structure assigned from NMR spectra. The mol­ecule forms hydrogen-bonded sheets parallel to the bc plane in the crystal. A disordered molecule of solvent, CHCl3, is included in the crystal.