Altmann, Eva; Aichholz, Reiner; Betschart, Claudia; Buhl, Thomas; Green, Jonathan; Lattmann, Rene; Missbach, Martin Bioorganic and Medicinal Chemistry Letters, 2006, vol. 16, # 9 p. 2549 - 2554 doi: 10.1016/j.bmcl.2006.01.104