Haginoya, Noriyasu; Komoriya, Satoshi; Osanai, Ken; Yoshino, Toshiharu; Nagata, Tsutomu; Nagamochi, Masatoshi; Muto, Ryo; Yamaguchi, Mitsuhiro; Nagahara, Takayasu; Kanno, Hideyuki Heterocycles, 2004 , vol. 63, # 7 p. 1555 - 1561