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The six new triterpene saponins 1–6 with a 21,23‐lactone skeleton were isolated from the MeOH extract of the aerial parts of Gynostemma pentaphyllum. Their structures were elucidated by 1D‐ and 2D‐NMR‐spectra interpretation as well as by chemical degradation.
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Yin et al. (2005) studied this question.
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