Cytotoxic and apoptosis-inducing ent-kaurane-type diterpenoids from the Japanese liverwort Jungermannia truncata Nees - Nagashima,F.; Kondoh,M.; Uematsu,T.; Nishiyama,A.; Saito,S.; Sato,M.; Asakawa,Y. (Chem Pharm Bull, 2002)