Hosoi, Shinzo; Kiuchi, Fumiyuki; Nakamura, Norio; Imasho, Masaaki; Ali, Mohammad Ahad; Sasaki, Youhei; Tanaka, Eriko; Tsumamoto, Yoshiyuki; Kondo, Kaoru; Tsuda, Yoshisuke Chemical and Pharmaceutical Bulletin, 1999, vol. 47, # 1 p. 37 - 43