Tanabe, Genzoh; Yoshikai, Kazuya; Hatanaka, Takanori; Yamamoto, Mizuho; Shao, Ying; Minematsu, Toshie; Muraoka, Osamu; Wang, Tao; Matsuda, Hisashi; Yoshikawa, Masayuki Bioorganic and Medicinal Chemistry, 2007, vol. 15, # 11 p. 3926 - 3937 doi: 10.1016/j.bmc.2006.10.014