Owa, Takashi; Okauchi, Tatsuo; Yoshimatsu, Kentaro; Sugi, Naoko Hata; Ozawa, Yoichi; Nagasu, Takeshi; Koyanagi, Nozomu; Okabe, Tadashi; Kitoh, Kyosuke; Yoshino, Hiroshi Bioorganic and Medicinal Chemistry Letters, 2000 , vol. 10, # 11 p. 1223 - 1226