Yoshida, Masao; Hayakawa, Ichiro; Hayashi, Noriyuki; Agatsuma, Toshinori; Oda, Youko; Tanzawa, Fumie; Iwasaki, Shiho; Koyama, Kumiko; Furukawa, Hidehiko; Kurakata, Shinichi; Sugano, Yuichi Bioorganic and Medicinal Chemistry Letters, 2005 , vol. 15, # 14 p. 3328 - 3332