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[摘要]：Three new dammarane-type triterpene saponins, 1-3, together with three known compounds, 4-6, were isolated from the aerial parts of Gynostemma pentaphyllum (THUNB) MAKINO. By means of chemical and spectroscopic methods, their structures were established as (20S)-3 beta,20,21-trihydroxydammara-23,25-diene 3-O[alpha-L-rhamnopyranosyl-(1 -> 2)] [beta-D-xylopyranosyl-(1 -> 3)]-beta-D-glueopyranosyl-21-O-beta-D-glocopvranoside (1), (20R,23R)-3 beta.20-dihydroxy-19-oxodammar-24-en-21-oic acid 21,23-lactone 3-O-[alpha-L-rhamnopyranosyl-(1 -> 2)][beta-D-xylopyranosyl-(1 -> 3)]-alpha-L-arabinopyranoside (2), and (21S,23S)-3 beta,20 xi 21,26-tetrahydroxy-19-oxo-21,23-epoxvdammar-24-ene 3-O-[alpha-L-rhamnopyranosyl-(1 -> 2)][beta-D-xylopyrimosyl-(1 -> 3)-alpha-L-arabinopyranoside (3). |
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