The isolation, characterisation, purity control and probable structure of gymnemic acid, the antisaccharine principle of Gymnema sylvestre R. Br. (Asclepiadaceae) has been reported. According to the results, gymnemic acid is the D‐glucuronide of a probably new hexahydroxy‐δ12‐oleanene which has been named gymnemagenin and which is esterified with various combinations of the following five acids: formic, acetic, n‐butyric, isovaleric, and tiglic acid. Gymnemic acid is not an absolutely pure substance. It is composed predominantly of gymnemic acid A1, which is accompanied by components having similar properties, especially the gymnemic acids A2, A3 and A4. The difference between these components probably lies in the absence or presence of one of the five named acids.
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Stöklin et al. (1967) studied this question.
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