^<13>C-NMR spectra of several Gardneria alkaloids and their derivatives were studied. The chemical shifts of C(15) and C(21) were found to be diagnostic for the configuration of the side chain double bonds between C(19) and C(20). As a result of the present study the E configuration of the ethylidene side chain of chitosenine (V) was confirmed.
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Aimi et al. (1978) studied this question.