Pimpinellin is a constituent of Cyrtomium fortumei (J.). Pimpinellin inhibits the growth of tumor cells via the induction of tumor cell apoptosis^[1]. In Vitro: Pimpinellin has potent cytotoxic activities against the three tumor cells MGC-803, PC3, and A375, with the IC₅₀ values of 14.4±0.3 μM, 20.4±0.5 μM, and 29.2±0.6 μM, respectively. Pimpinellin inhibits the growth of MGC-803 cells via the induction of tumor cell apoptosis, with apoptosis ratio of 27.44% after 72 h of treatment at 20 μM^[1].