Saikosaponin B2 is an active component from Bupleurum kaoi root, acts as an entry inhibitor against HCV infection[1]. Anti-cancer activity[2].
References:
[1]. Lin LT, et al. Saikosaponin b2 is a naturally occurring terpenoid that efficiently inhibits hepatitis C virus entry. J Hepatol. 2015 Mar;62(3):541-8.
[2]. Ma Q, et al. Antitumor effects of saikosaponin b2 on breast cancer cell proliferation and migration. Mol Med Rep. 2019 Aug;20(2):1943-1951.