Stilbostemin N can be isolated from ated from the rhizomes of D. japonica[1].
References
[1] Kim KH, et al. Furostanol saponins from the rhizomes of Dioscorea japonica and their effects on NGF induction. Bioorg Med Chem Lett. 2011 Apr 1;21(7):2075-8. DOI:10.1016/j.bmcl.2011.02.003
