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A new furostanol saponin presenting moderate bioactivity of inducing morphological deformation of Pyricularia oryzae mycelia was isolated from Dioscorea futshauensis R.Kunth by bioactivity-guided fractionation. The structure was established as 26-O-b-D-glucopyranosyl-3b, 26-diol-23(S)-methoxyl-(25R)-furost-5,20 (22)-diene-3-O-[a-L-rhamnopyranosyl (12)-b-D- glucopyranosyl (13)]-b-D-glucopyranoside on the basis of chemical evidencesand spectral analysis, especially by 2D-NMR techniques.
A new furostanol saponin presenting moderate bioactivity of inducing morphological deformation of Pyricularia oryzae mycelia was isolated from Dioscorea futshauensis R. Cunth by bioactivity-guided fractionation. The structure was established as 26-ObD-glucopyranosyl-3b, 26- diol- 23 (S) -methoxyl- (25R) -furost-5,20 (22) -diene-3-O- [aL- rhamnopyranosyl (12) -bD- glucopyranosyl (13)] - bD-glucopyranoside on the basis of chemical evidences and spectral analysis, especially by 2D-NMR techniques.