Hydroxysaikosaponin C is a natural product that can be isolated from the root of Bupleurum falcatum.
[1]. Ebata N, et al. Saponins from the root of Bupleurum falcatum. Phytochemistry. 1996 Feb;41(3):895-901.
[1]. Ebata N, et al. Saponins from the root of Bupleurum falcatum. Phytochemistry. 1996 Feb;41(3):895-901.