Cho, Hidetsura; Katoh, Susumu; Sayama, Shinsuke; Murakami, Kengo; Nakanishi, Hiroyuki; Kajimoto, Yasuyuki; Ueno, Hiroshi; Kawasaki, Hisashi; Aisaka, Kazuo; Uchida, Itsuo Journal of Medicinal Chemistry, 1996 , vol. 39, # 19 p. 3797 - 3805