Aoyagi, Yutaka; Hitotsuyanagi, Yukio; Hasuda, Tomoyo; Fukaya, Haruhiko; Takeya, Koichi; Aiyama, Ritsuo; Matsuzaki, Takeshi; Hashimoto, Shusuke Bioorganic and Medicinal Chemistry Letters, 2006, vol. 16, # 7 p. 1947 - 1949 doi: 10.1016/j.bmcl.2005.12.098