Chemical Studies on Mexican Plants Used in Traditional Medicine, XV. Sesquiterpene Evoninoate Alkaloids from Hippocratea excelsa

Abstract
Three sesquiterpene evoninoate alkaloid, hippocrateine I [1], hippocrateine II [2], and emarginatine A have been isolated from the root and stem barks of Hippocratea excelsa. Compounds 1 and 2 are new naturally occurring substances. The structure of 1 was unequivocally established by X-ray crystallographic analysis, and the structure of the second new alkaloid was deduced by spectral analysis.

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