Ueno, Kotomi; Yoneyama, Hidetaka; Mizutani, Masaharu; Hirai, Nobuhiro; Todoroki, Yasushi Bioorganic and Medicinal Chemistry, 2007, vol. 15, # 18 p. 6311 - 6322 doi: 10.1016/j.bmc.2007.06.010