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P/ante Med. 59. Supplement Issue 1993 figurations at the axes. The only example for atropisomeric pairs in this plants is the fully dehydrogenated alkaloid dioncophyllacine A, which occurs as a mixture of its atropoenantiomers 4 and ent-4 (8).The first occurrence of atropo-diastereomeric representatives, though only in minor amounts, is also of pharmacological interest, since it now allows us to investigate the influence of the configuration at the axis on the biological activity. AcknowledgementsThis work was supported by the Deutsche Forschungsgemeinschaft (Graduiertenkolleg 'Magnetische Kernresonanz in vivo und ifl Vitro für die biologische und medizinische Grundlagenforschung") and the Fonds der Chemischen Industrie.

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