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The total assignment of the 13C‐shifts of the complex Vinica rosea L. alkaloids vincaleucoblastine, leurosidine and leurosine and of a synthetic isomer of the latter is presented. The structure of leurosidine is corrected and a tentative structure for the acid‐catalyzed product of isomerization of leurosine is proposed.
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Wenkert et al. (1975) studied this question.
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