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A new oleanene glucuronide called melilotus-saponin O2 (1) was isolated together with three known ones (soyasaponin I, astragaloside VIII, wistariasaponin D) from the aerial parts of Melilotus officinalis (L.) Pallas (Leguminosae). The structure of 1 was determined to be 3-O-alpha-L-rhamnopyranosyl-(1--&gt;2)-beta-D-xylopyranosyl- (1--&gt;2)-beta-D-glucuronopyranosyl melilotigenin by spectroscopic and chemical methods.

A New Oleanene Glucuronide Obtained from the Aerial Parts of Melilotus officinalis.