Kubo, Kazuo; Ohyama, Shin-Ichi; Shimizu, Toshiyuki; Takami, Atsuya; Murooka, Hideko; Nishitoba, Tsuyoshi; Kato, Shinichiro; Yagi, Mikio; Kobayashi, Yoshiko; Iinuma, Noriko; Isoe, Toshiyuki; Nakamura, Kazuhide; Iijima, Hiroshi; Osawa, Tatsushi; Izawa, Toshio Bioorganic and Medicinal Chemistry, 2003 , vol. 11, # 23 p. 5117 - 5133