A number of related alkaloids of unknown structure have been isolated from the Ormosia species.The molecular structure and stereoconfiguration of one of the alkaloids, C21H3sNa, has been elucidated.The space group is P1 with cell dimensions: a=6.79, b=10.61,c=13.41A; a=95 °, fl =97 ° 20', 7 = 103° 55'.The molecule is composed of six six-membered rings, five of which have the chair configuration and one the boat configuration.The chemical formula is found to beSince the alkaloid is in the form of a free base, there is no hydrogen bonding.The structure was solved by obtaining phases directly from the structure factor magnitudes by the symbolic addition procedure.By hand computation, 286 phases were determined from which a well-resolved E-map was computed.
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Karle et al. (1964) studied this question.