Tubingensin B, a Cytotoxic Carbazole Alkaloid from the Sclerotia of Aspergillus tubingensis

The crystal structure of tubingensin B, (1[alpha],4[alpha],4a[alpha],7[alpha],14b[beta])-(-)-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.

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