Molluscicidal triterpenoidal saponin from Lysimachia sikokiana.

Abstract
The main molluscicidal activity of the methanol extract of Lysimachia sikokiana is due to several triterpenic saponins called sakuraso-saponins. The most active component was isolated from the aerial parts and elucidated as 3-O-.beta.-xylopyranosyl-(1 .fwdarw. 2)-.beta.-glucopyranosyl-(1 .fwdarw. 4)-[.beta.-glucopyranosyl-(1 .fwdarw. 2)]-.alpha.-arabinopyranosyl protoprimulagenin A, named lysikoianoside 1, on the basis of 1H-and 13C-nuclear magnetic resonance spectral data and methylation analysis results.

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