Fuchi, Nobuhiro; Iura, Yosuke; Kaneko, Hiroaki; Nitta, Aiko; Suyama, Kazuharu; Ueda, Hiroshi; Yamaguchi, Shinichi; Nishimura, Kazumi; Fujii, Shigeo; Sekiya, Yumiko; Yamada, Masateru; Takahashi, Toshiya Bioorganic and Medicinal Chemistry Letters, 2012 , vol. 22, # 13 p. 4358 - 4361