Okamoto, Osamu; Kobayashi, Kensuke; Kawamoto, Hiroshi; Ito, Satoru; Yoshizumi, Takashi; Yamamoto, Izumi; Hashimoto, Masaya; Shimizu, Atsushi; Takahashi, Hiroyuki; Ishii, Yasuyuki; Ozaki, Satoshi; Ohta, Hisashi Bioorganic and Medicinal Chemistry Letters, 2008 , vol. 18, # 11 p. 3282 - 3285