The alkaloids tuberostemonine, oxotuberostemonine, and the new base tuberostemonine-A have been isolated from the rhizomes of Stemona sessilifolia. Tuberostemonine has been oxidized to oxotuberostemonine and tuberostemonine-A has been related to tuberostemonine through common oxidation products. Study of transformation products of tuberostemonine has enabled assignment of partial structure V to the alkaloid.
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Edwards et al. (1962) studied this question.
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