Takeshita, Hiroshi; Watanabe, Jun; Kimura, Yoichi; Kawakami, Katsuhiro; Takahashi, Hisashi; Takemura, Makoto; Kitamura, Akihiro; Someya, Kazuhiko; Nakajima, Ryohei Bioorganic and Medicinal Chemistry Letters, 2010 , vol. 20, # 13 p. 3893 - 3896