Muraoka, Osamu; Yoshikai, Kazuya; Takahashi, Hideo; Minematsu, Toshie; Lu, Guangxin; Tanabe, Genzoh; Wang, Tao; Matsuda, Hisashi; Yoshikawa, Masayuki Bioorganic and Medicinal Chemistry, 2006, vol. 14, # 2 p. 500 - 509 doi: 10.1016/j.bmc.2005.08.040