Ochi, Takeshi; Sakamoto, Masato; Minamida, Akira; Suzuki, Kenji; Ueda, Tomohiko; Une, Teruaki; Toda, Hiroshi; Matsumoto, Kazuya; Terauchi, Yoshiaki Bioorganic and Medicinal Chemistry Letters, 2005 , vol. 15, # 4 p. 1055 - 1059