Three new olean-type triterpenoid saponins, namely 3-O-(2-O-acetyl-β-D-glucopyranosyl) oleanolic acid-28-O-(β-D-glucopyranosyl) ester (1), 3-O-(6-O-acetyl-β-D-glucopyranosyl) oleanolic acid-28-O-(β-D-glucopyranosyl) ester (2) and 3-O-(β-D-glucopyranosyl) oleanolic acid-28-O-(6-O-acetyl-β-D-glucopyranosyl) ester (3), were isolated from the aerial parts of Eclipta prostrata (L.). Their structures were elucidated based on 1D and 2D NMR and MS spectroscopic data.
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Xi et al. (2013) studied this question.
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