Two Kedde-positive compounds, isolated in crystalline form from bulbs of Ornithogalum umbellatum, were shown by their infrared and ultraviolet spectra to be cardenolides. Paper chromatographic analyses of the hydrolysates of these compounds indicated that both compounds contain sarmentogenin as the aglycone moiety, and that one is a rhamnoside while the other is the corresponding rhamnoside-glucoside. The identification of the monoglycoside as rhodexin A, i.e. sarmentogenin-α-L-rhamnoside, a glycoside previously isolated from Rhodea (Rohdea) japonica, was confirmed by comparison with an authentic sample. The diglycoside, an apparently new compound of composition sarmentogenin-rhamnose-glucose is designated rhodexoside.
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Smith et al. (1967) studied this question.
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