Iwasaki, Tameo; Kondo, Kazuhiko; Kuroda, Tooru; Moritani, Yasunori; Yamagata, Shinsuke; Sugiura, Masaki; Kikkawa, Hideo; Kaminuma, Osamu; Ikezawa, Katsuo Journal of Medicinal Chemistry, 1996 , vol. 39, # 14 p. 2696 - 2704