Kaneko, Toshihiko; Clark, Richard S. J.; Ohi, Norihito; Ozaki, Fumihiro; Kawahara, Tetsuya; Kamada, Atsushi; Okano, Kazuo; Yokohama, Hiromitsu; Ohkuro, Masayoshi; Muramoto, Kenzo; Takenaka, Osamu; Kobayashi, Seiichi Chemical and Pharmaceutical Bulletin, 2004 , vol. 52, # 6 p. 675 - 687