Takashiro, Eiji; Hayakawa, Ichiro; Nitta, Tamayo; Kasuya, Atsushi; Miyamoto, Shuichi; Ozawa, Yuji; Yagi, Ryuichi; Yamamoto, Ikue; Shibayama, Takahiro; Nakagawa, Akihiko; Yabe, Yuichiro Bioorganic and Medicinal Chemistry, 1999, vol. 7, # 9 p. 2063 - 2072 doi: 10.1016/S0968-0896(99)00127-3