Naito, Hiroyuki; Ohsuki, Satoru; Atsumi, Ryo; Minami, Megumi; Mochizuki, Mineko; Hirotani, Kenji; Kumazawa, Eiji; Ejima, Akio Chemical and Pharmaceutical Bulletin, 2005 , vol. 53, # 2 p. 153 - 163