Yoshikawa, Kenji; Yoshino, Toshiharu; Yokomizo, Yoshihiro; Uoto, Kouichi; Naito, Hiroyuki; Kawakami, Katsuhiro; Mochizuki, Akiyoshi; Nagata, Tsutomu; Suzuki, Makoto; Kanno, Hideyuki; Takemura, Makoto; Ohta, Toshiharu Bioorganic and Medicinal Chemistry Letters, 2011 , vol. 21, # 7 p. 2133 - 2140