Wang, Yikang; Benn, Alex; Flinn, Nick; Monk, Tracy; Ramjee, Manoj; Watts, John; Quibell, Martin Bioorganic and Medicinal Chemistry Letters, 2005, vol. 15, # 5 p. 1327 - 1331 doi: 10.1016/j.bmcl.2005.01.022