Suhara, Yoshitomo; Ono, Keiichiro; Yoshida, Akihiro; Fujishima, Toshie; Saito, Nozomi; Honzawa, Shinobu; Kishimoto, Seishi; Sugiura, Takayuki; Waku, Keizo; Takayama, Hiroaki; Kittaka, Atsushi Heterocycles, 2004, vol. 62, p. 423 - 436