Methyl protogracillin (NSC-698793), isolated from the roots of Dioscorea opposite Thunb, exhibits strong anti-cancer activity[1].
[1]. Hu K, et al. The cytotoxicity of methyl protoneogracillin (NSC-698793) and gracillin (NSC-698787), two steroidal saponins from the rhizomes of Dioscorea collettii var. hypoglauca, against human cancer cells in vitro. Phytother Res. 2003 Jun;17(6):620-6.
















