Hanashima, Shinya; Mizushina, Yoshiyuki; Yamazaki, Takayuki; Ohta, Keisuke; Takahashi, Syunya; Sahara, Hiroeki; Sakaguchi, Kengo; Sugawara, Fumio Bioorganic and Medicinal Chemistry, 2001, vol. 9, # 2 p. 367 - 376 doi: 10.1016/S0968-0896(00)00252-2