Nishi, Takahide; Ishibashi, Koki; Takemoto, Toshiyasu; Nakajima, Katsuyoshi; Fukazawa, Tetsuya; Iio, Yukiko; Itoh, Kazuhiro; Mukaiyama, Osamu; Yamaguchi, Takeshi Bioorganic and Medicinal Chemistry Letters, 2000 , vol. 10, # 15 p. 1665 - 1668