Yoshida, Yoshiki; Barrett, David; Azami, Hidenori; Morinaga, Chizu; Matsumoto, Satoru; Matsumoto, Yoshimi; Takasugi, Hisashi Bioorganic and Medicinal Chemistry, 1999, vol. 7, # 11 p. 2647 - 2666 doi: 10.1016/S0968-0896(99)00203-5