Naito, Youichiro; Akahoshi, Fumihiko; Takeda, Shinji; Okada, Takehiro; Kajii, Masahiko; Nishimura, Hiroko; Sugiura, Masanori; Fukaya, Chikara; Kagitani, Yoshio Journal of Medicinal Chemistry, 1996 , vol. 39, # 15 p. 3019 - 3029