Die Cardenolide der Samen von Strophanthus gratus (Wall. et Hook.) Franch. 2. Mitteilung. Glykoside und Aglykone, 284. Mitteilung

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Abstract
Extracts from the seeds of Strophanthus gratus showed the presence of 30 cardenolides after being subjected mainly to techniques of preparative separation and partly through acetylation of these concentrates. These 30 cardenolides have been differentiated from one another by paper chromatography in five solvent systems. Among the identified cardenolides were most of the compounds isolated earlier by Jäger et al. [1]. In accordance with the results of these authors, ouabain (ca. 7%) was by far the predominant constituent, followed by acolongifloroside K (ca. 0.4%) and strogoside (0.4%). These three compounds have been isolated in crystalline form. Strogoside (structure elucidation see following paper) is a new name for the compound K described by JÄGER et al. Of the compounds present in trace amounts, only sarmentoside E was isolated in crystalline form directly, and the new compound λ after acetylation, which yielded O‐acetyl‐λ. The compound λ seems to be a dilactone with a structure similar to that of strogoside but containing rhamnose as the sugar and an aglycone probably different from strogogenin.