Kimura, Tooru; Shuto, Daisuke; Kasai, Soko; Liu, Ping; Hidaka, Koushi; Hamada, Takashi; Hayashi, Yoshio; Hattori, Chinatsu; Asai, Masashi; Kitazume, Shinobu; Saido, Takaomi C.; Ishiura, Shoichi; Kiso, Yoshiaki Bioorganic and Medicinal Chemistry Letters, 2004, vol. 14, # 6 p. 1527 - 1531 doi: 10.1016/j.bmcl.2003.12.088