Nomura, Takashi; Iwaki, Tsutomu; Yasukata, Tatsuro; Nishi, Koichi; Narukawa, Yukitoshi; Uotani, Koichi; Hori, Toshihiko; Miwa, Hideaki Bioorganic and Medicinal Chemistry, 2005 , vol. 13, # 24 p. 6615 - 6628