Acta Cryst. (2001). E57, o909-o912  [ doi:10.1107/S1600536801014234 ]

Cycloechinulin, a Trp-Ala-derived alkaloid from the fungus Aspergillus ochraceus

L. K. Hansen, F. C. Størmer, D. Petersen and A. J. Aasen

Abstract: The structure of the Trp-Ala-derived, non-basic alkaloid cycloechinulin from the mycelial mat of the fungus Aspergillus ochraceus is described; systematic name: (3S)-2,3,8,9-tetrahydro-11-methoxy-3,8,8-trimethylpyrazino[1',2':1,2]azocino[5,4-b]indole-1,4-dione-methanol (4/1), C₂₀H₂₁N₃O₃·0.25CH₄O. There are four independent molecules plus one methanol molecule in the asymmetric unit. The conformations of molecules 1-3 are almost identical, while molecule 4  shows a different conformation in the fused 8-6 ring moiety.

Online 11 September 2001

Copyright © International Union of Crystallography
IUCr Webmaster