The seeds of Strophanthus gratus not only contain 4–8% ouabain but also a number of other cardenolide glycosides. The following compounds have been isolated in crystalline form: sarmentoside E, sarmentoside A, acolongifloroside K, and 5 other, probably new compounds: B, δ, η, K and λ1. Three more glycosides have been isolated in the form of their crystalline O‐acetyl‐derivatives: O‐acetyl‐sarmentoloside and two probably new compounds, ϵ1′ and ϵ2′. In addition, the presence of the four following glycosides was demonstrated by paper chromatography and further confirmed by paper chromatography after acetylation: bipindoside, sarmentoside D, tholloside and sarhamnoloside. The structures of the new compounds have not yet been investigated.
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Jäger et al. (1965) studied this question.
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