Antitumor Agents: LXXXVII. Cytotoxic Antileukemic Canthin-6-one Alkaloids from Brucea antidysenterica and the Structure Activity Relationships of their Related Derivatives1 - Fukamiya, Narihiko; Okano, Masayoshi; Aratani, Takaaki; Negoro, Kenji; Lin, Yuh-Meei; Lee, Kuo-Hsiung (Planta Medica, 1987)