Ohwada, Jun; Ebiike, Hirosato; Kawada, Hatsuo; Tsukazaki, Masao; Nakamura, Mitsuaki; Miyazaki, Takuya; Morikami, Kenji; Yoshinari, Kiyoshi; Yoshida, Miyuki; Kondoh, Osamu; Kuramoto, Shino; Ogawa, Kotaro; Aoki, Yuko; Shimma, Nobuo Bioorganic and Medicinal Chemistry Letters, 2011 , vol. 21, # 6 p. 1767 - 1772