Murata, Chiyomi; Masuda, Toshinobu; Kamochi, Yasuko; Todoroki, Kenichiro; Yoshida, Hideyuki; Nohta, Hitoshi; Yamaguchi, Masatoshi; Takadate, Akira Chemical and Pharmaceutical Bulletin, 2005 , vol. 53, # 7 p. 750 - 758